Fuel pump info needed Options

[Fujifilm]

OK here goes, I am at the stage where I am going to scrap the car I am so sick of it. Have posted on another forum but had no luck so hoping someone can give me an idea.

The car is a 1995 convertible (uk) 2.0 gt manual which is the 3S-GE engine with 70,000 miles and full toyota service history.

The symptoms are, from cold it will hesitate but not always straight away, could drive half mile before it does it. When it does I can have my foot to the floor and nothing happens. Then it surges and the car will run perfectly. EXCEPT if trying to drive at 20 or 30 mph it runs rough like its in the wrong gear. Driving at 35 and above it runs perfectly, Just to add to the problem, occasionally if I reverse and stop the idle will fluctuate and stall.

Jumping the diag pins shows no faults!

So far I have changed complete throttle body with sensors from a car that was known to run perfectly.
Fuel filter, water temp sensor, air temp sensor, spark plugs, distributor cap, rotar arm, thermostat.

As far as I can tell all vacuum hoses look OK

I am stumped for ideas.

Help appreciated.
.

This post has been edited by Fujifilm: Aug 28, 2014 - 2:57 PM

[VavAlephVav]

I also say check the ignition timing by renting a timing light. you clip the wire to the no 1 (far left) spark plug wire then the light should flash just as the little mark on the crank pulley hits 10 BTDC. If not you rotate the distributor till it does.
also, you didn't mention the Ignition coil and the condenser(small capacitor) inside the distributor. if these have never been changed in 20 years they definitely make a big difference in the quality of the spark.

also when was the timing belt last done? if the timing was set wrong by the position of the crank and cam with the timing belt it could act a lot like that.
and how about the fuel filter? if you've never changed it yourself you should.

This post has been edited by VavAlephVav: Aug 10, 2014 - 9:41 PM