Jerking and TPS sensor Options

[UVZ164]

Hey guys,

For the last few months my car has been jerking ALOT when going on or off the throttle. Its a 97 ZR(GT) 5sfe manual. Its not the normal manual tranny shake when you let off, its very violent and all my passengers comment which kills me a little bit every time. So far i've replaced the:
* spark plugs
* dizzy
* cleaned the TB and IACV valve
* new air filter
* cleaned all moving mechanisms with the throttle cable and pedal assembly to ensure no sticking

However the jerking lives on

The only other things i could think of are the spark plug wires and the TPS sensor.
I borrowed an ohmetre and did some testing of the TPS. In the fully closed position the reading is 0.4 and the allowable range is (0.2 - 5.7). When fully open the reading is 2.6 and the range is (2 - 10.2). Theres another test that is two diff pins that reads 3.4 and the range is(2.5 - 5.9). Do the first two seem a little low? Yes they are in the allowable range but almost every other electrical connection i have tried has been smack bang in the middle of the range.
I also did a continuity test of the TPS sensor. When the distance between the throttle stop screw(most commonly knows as the idle adjust screw) and the plate is 0.5mm there should be continuity and when 0.7mm or greater there should be no continuity. Now when i have it at 0.5mm (using a feeler gauge) the ohmetre reads OL and the same thing when at 0.7mm. Does this null continuity result mean the TPS sensor is bad? And could that possibly be whats causing the jerking? If not what do you think could be causing it?

Quick one at the end, what should the idle be on a 5sfe manual? The BGB says that all 5sfe no matter what year or tranny ahould be at 700, however the BGB i have is for a 98 OBDII car and mine is a OBDI. I have also read that the manual idle should be up around 800-850. Mine is currently at 700 but there is alot of vibration and i have only recently replaced the front and rear with non-polyurethane engine mounts. Should i raise it up to 800 using the screw or leave it at the 700?

Thanks alot guys!

Reece

[UVZ164]

Thanks for the replys guys. Unfortunately bigger problems have resurfaced, my clutch took a dump on me a while ago racing so i had it replaced with a new exedy heavy duty sports clutch, as my transmission was grinding horribly they also rebuilt it for me. Before the clutch was replaced i could hear a grinding noise on deceleration which i thought was the gearbox. After it was replaced and the transmission rebuilt i could still hear the noise very faintly and was told that it was gear whine since a previous owner has prob used auto trans fluid which will cause that noise(never believed that but what the hell the grinding was gone and shifting was super smooth). Since then i have not been to the track in the celica so no horrific loads have been put on it. But this horrible grinding noise has reappeared on deceleration. I took it back and they said something is causing the transmission to vibrate and the gears are rattling which is causing the noise im hearing(not there initial gear whine bs story). They took the transmission back out and said that its fine and that the clutch is causing the noise. When they removed the first clutch the centre had seized and expanded which caused the noise. He then told me that the same thing has happened and the springs have stretched too. So i said it cant be the clutch just dying for no reason what could be causing it? He said something along these lines i think and this is what i need clarification on:
Our cars aparently have some sort of valve so if we pull our foot all the way off the accelerator suddenly it wont just close the throttle body butterfly valve and cut injectors immediately. He is saying that this was malfunctioning which was causing the clutch to go bad. I asked if he could fix it and he said he couldnt work out why it wasnt working properly and to fix it would be too expensive. I have the BGB and have done ALOT of reading trying to find this valve but the only thing i can think of the IACV which is working correctly. Can anyone tell me if such a valve exists and point me in the right direction on how to find it and possibly fix it.
I should add the guys doing it are a friends parents but even having people do it that i have known for a long time i still feel like i being screwed

Thanks guys