engine idle problem Options

[RumpleForeskin05]

well ill start from the beginning so you can fully understand, I bought a 94 celica for relatively cheap. It didnt take long for problems to happen. From a cold start it was fine, but when the engine warmed up it would idle up and down and sometimes it would die. The problem got worse and it would die everytime I hit the clutch if i didnt rev it while clutching. A couple days after this started I got stuck in some snow and tried getting out, blew my engine even tho i never went past 5000 RPMs. I bought a JDM 3SFE and just completed the swap but the problem still persists. Whenever the engine is hot (not overheating, the temp guage is less than halfway towards the top) it will idle at 1100 for a bit, then down to 500 or below, then when it gets real low the car will shake badly and sometimes after that itll go back up or just die compltely. help me out PLEASE

[lagos]

why didnt u put another 5sfe in there? sounds like you have a vac leak, or your timing if off. have you checked those?

[RumpleForeskin05]

why didnt u put another 5sfe in there? sounds like you have a vac leak, or your timing if off. have you checked those?
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3SFE was about 1000 dollars cheaper, I havent checked those thanks for the advice also a friend said it could be the o2 sensor or injectors, does that sound possible?

[ArizonaRed]

check your o2 sensors and your throttle position sensor. Also, check the codes on your ecu and then clear them after replacing the sensors. That fixed mine.

[RumpleForeskin05]

ok thanks ill get all that checked out, starting with the O2 sensors, anyone else have anything to add?

[celica3sgte]

Crazy idles=vac leak. Sounds like the typical vac leak. Does it shoot up in rmps and then gradually come down?

[RumpleForeskin05]

yeah it does, itll start at like 1100, then to 500, then to like 100 and if it doesnt die it will shoot back up, this is probably a dumb question but how do i check for a vac leak

[ghostdog]

spray carb cleaner on suspected leak points, if theres a leak the cleaner will get sucked in and will change the idle mometarily before it returns to normal

[RumpleForeskin05]

well i just filled up the tank with regular gas instead of premium which is what i had been using, and it sort of stopped... I wonder if the two are related