vs rough idle and exhaust chugging

[vlexec]

hi guys, hope someone can help , im runing out of ideas. recently bought 96 vs that had a blown head gasket. instead of fixing it i thought i would get a motor from wreckers. had nothing but problems. motor idles really rough and it chuggs at the exhaust pipe. if you increase revs it gets better but still has a miss. i have replaced spark plugs, plug leads, cleaned throtle body, swapped all three coils from another car that runs fine, replaced fuel filter but still it runs like a bag of s**t. any ideas would be greatly appreciated. cheers

[chrisdoesitbetter]

Check you cat and your O2 sensors

[DannyboyDS]

Soooooo many posibilities from what you ahve described, have you done an error code check?

did you remove the sensors from the throttle body when you cleaned it? I know the problem allready existsed beforehand but I fixed a rough idle with exhaust chugging on deceleration by replacing the throttle position sensor. Just dont bother with a second hand one, as 4 months later I had major issues with the auto, turned out that the TPS was on the way out againa nd had made it seem like the auto was dead.

There is a procedure in the haynes and gregorys for checking the condition of the sensors, i'm not suggesting you blindly spend money.

[vr94ss]

If you don't have error codes I'd suggest a compression test. Low compression in a cylinder will cause chugging/missing/rough idle and revving it will often alleviate it because as you spin it faster there is less time for it to lose compression before it fires.

[Not_An_Abba_Fan]

Are the leads on in the correct order?

[vlexec]

hi guys, hope someone can help , im runing out of ideas. recently bought 96 vs that had a blown head gasket. instead of fixing it i thought i would get a motor from wreckers. had nothing but problems. motor idles really rough and it chuggs at the exhaust pipe. if you increase revs it gets better but still has a miss. i have replaced spark plugs, plug leads, cleaned throtle body, swapped all three coils from another car that runs fine, replaced fuel filter but still it runs like a bag of s**t. any ideas would be greatly appreciated. cheers

thanks for the replies , i dont get any error codes from computer only no 12. leads are on right order checked a few times in case i stuffed it. when i cleaned throttle body left tps on but removed and cleaned the iac valve. think its time to do a compression test .dont really want to change motor again.

[hako]

Try swapping the injectors and the fuel pressure regulator from the old motor - it's not unusual for the fuel lines to get water dirt in them when removed from a wreck. This could cause your problem (along with quite a few others as Dannyboy DS suggests.