help car is broke

[rsTeclipse325]

i have a problem with my car usually in the mornings not all the time but usually when i start the car it dosent idle right and if i give i give it gas and it spins less than 2,000 rpms it dies and also when i switch gears if i let it sit and worm up for a while it stops. i took it to a mechanic and they asked me if i took something off my ecu when i changed my air filter which i dident they "fixed" it and it ran right for about 3 days then i put a cold air on it and it started doing it again i think it has something to do with my throttle body or my oxygen sensor but i dont know i just recently started getting into cars i cant find anything anywhere about this problem any help would be apreciated.

its a 96 eclipse

[FourG63 97GST]

and Eclipse what?
mods?

[jer28usa]

My eclpise does the same thing. I have a 91 fwd 1.8l with a manual tranny. I read that the ecu determines idle speed, and so its pretty much reccomended to try and not adjust the idle. So I guess we need to find out what the ecu looks at in order to determine the idle speed. Does it look at the coolant temp sensor, how many more things??

[Eclipseoholic]

My Eclipse 91 2.0 does the same exact thing i was told u might have a vaccum leak somewhere so i just recently changed all my old vacumm hoses with new ones and until my tranny comes back from the shop i will not find out if it is fixed.So ill let you know if it fixed it i do know that all of my hoses were leaking and be aware of the fuel pressure regulator hose becuz i think that might of been the problem but i wont know for a week when my tranny comes back