idle and running problem

[nickschmit25]

ok so my check engine light came on the other day and it was hard to start so i got it scanned and it was the coolant temp sensor so i changed all 3 sensors and light went out. well now its still hard to start and then it idles weird untill it warms up then runs fine. but if it sets for a bit then its hard to start again. so i cleaned the iacv, tp sensor and switch, and changed the spark plugs. well now its still having the idle and start problems but now when you drive it kinda sputters and when you get on it, it sputters and u can smell gas but there is no leak that i can see and it says on the A/f guage its running rich. and i cleaned the o2 sensor. Any ideas as to whats causing the problems now? all i have for mods is a 3 inch exhaust and k&n filter. stock boost and fuel system

 

[RSdriver98]

Maybe a burnt valve. Have leak down tests done and see what they that says.