car is always pulling need help
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car is always pulling need help ok well my car is always pulling even when i let off the gas and at stop signs i was told it was because my O2's were bad when a friends scanned my car with HP tuners well i just put brand new ones on it and the damn thing still pulls im pretty sure all my vaccum is correct like the pcv lines and all that so im kinda stuck i did switch the 98 heads to a 99 style could that be my issue and maybe i still dont have the pcv correct?? does anyone else have a 98 and switched to newer styles heads and have this problem????any help appreciated and if it matters i have a cam/heads/headers/stall converter and i have had it tuned
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it will also just hold the rpms too say im im doing 30 and im at 1700 and i slow down to 10 it will stay on 1700 and have a lot of pressure on the brakes
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my car did this, perfect cruise control at 40 mph hahaha anytime i pulled the e-brake and put it in park the car would lurch forward. check your pcv line connecting to your throttle body, mine had a hole in it for the longest time and i think it got worse lately . . . and my IAC was dirty as hell so i cleaned that off. now my car runs perfect! btw 98 and 99 had the same style heads, heads didn't change till mid 2000
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i will check that and no 98 were perimeter bolts and 99 up are centerbolt and i got a good deal on some 99's milled and some extra's and that changed all my pcv
so as i was about to call around for a new one he says "wait let me try something" pulls his off his TA and it looks the same so he takes a cloth to both and says "there ya go, brand new dipshit!" hahaha i should've taken a pic of it cause it looked horrible and was causing my IAC failure SES code to come up, cleanin it off fixed my problem, good luck with yours! and thanks for the info on the heads 
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From: NA,Indiana/louisville, ky
i did all of these things and nothing has worked so i talked to my tuner and im gonna get another tune tomorrow and maybe this will fix it i really hope because im almost at the point of dumping my car in the river
I'm no tuner, but I'm pretty sure it has something to do with your IAC count being too high IIRC. If your too low, (not enough air), then you'll get the bucking and surging at low rpms, if your too high, then the car will pull. I'm just going from memory of my previous a4 car I had back in the day, so cut me some slack if I'm off a bit