Rough idle problem

**ngysel1377** · 10-17-2008 08:45 AM

Hey,

Ive had a rough idle issue for the past 6 months. It seems to come and g oevery so often. Its a 2000 A4 1.8T. The car seems to want to pull me through the intersection when im stopped and in drive at a light. But when I put the car in neutral all is fine and the car stops the rough idle. Any opinions on what it could be? Im thinking some kind of tranny problem? which i hope is not the case. Any help would be greatly appreciated.

Thanks

**TverRus69** · 10-17-2008 06:20 PM

what kind of tranny do you have? could be tps, most likely tho its the MAF. Also clean your throttle body

**ngysel1377** · 10-19-2008 12:30 PM

its an automatic tranny..whats tps?

**TverRus69** · 10-19-2008 03:24 PM

tps is the throttle position sensor. Its a potentiometer that can go bad and screw with your system. The tps is affects injection and could cause your rough idle. The MAF is another big possibility - however if the MAF is at fault then you will have rough accelleration. For example if you slowly start pressing on the gas while the car is in park/neutral the rpm should go up but should start staggering at about 2-3k.
Do you have any codes/a check engine light for a misfire? The coils could have gone bad too.