Engine Sputtering, Checked Alredy..

[victorgallas]

Hey first off, i already cheked other post, but i coul dnot find suffient information..

well here is what goes on.

When ever i drive the car, this been happening a lot lately, the engine sputters, the car does not take off like it should, feels heavy, and my MPG is down to 22. I knwo this engine can do more mpg//

I do not have a check engine light, and the O2 sensor is less than a years old, so i dont think it could be it, but if its failing, what are the symponts..

also the car revvs very high on startup, then it has an erratic idle, keeps going up and down whenever im coming to a stop, not when sitting on idle. And i cleaned my iddle speed valve like a month ago. and while at it i've checked all the sensor around it, Air mass, temp sensor, etc all are good. The weird thing is that the engine pulls great whenever is cold outside,, i feel that the engine is not being able to measure the air temperatude and density correctly to the amount of fuel used.

I really do think that the engine is running lean, because you can smell some gas smell form the exaust.

How do you test youre fuel injectors? Leaking or sutck fuel injectors? Any ideas?

My spark plugs are new, no oil leaks around the,, and all coils have been tested and work.. so im kinda of lost..

Please give me any idea of what to look for, anything helps.
thnak you