Rough idle after headers installed

Exhaust leak making a lean condition

 

Yes double check for leaks and did you get your ecus tuned?

 

When you say you replaced your cracked manifolds, do you mean you personally ir this shop you mentioned? Either way, sometimes the stud nuts need retightened after the first drive or two. Also, recheck the 4 O2 sensors. Finally, was antiseeze compound used?

 

Did you drive it just that once?

 

See if they installed new donut ex gaskets between the headers and cat pipes.


I tried to reuse mine and they were too compressed and cracking so I had an ex leak in this position.

If you can scan you car… you can better diagnose the issue. Was it caused by install? Or something failed at same time?

if shop does not have a scanner then they might have trouble.


I use obd facile, it scans both banks

Check for codes and lt and st fuel trims.

Gl

 

First off did you check the flatness of the new manifolds with a straight edge before they were fitted, if so then try a thin feeler gauge between the head and the manifold to see it is compressing the gasket. Fitting this sort of thing you need to be checking with feeler gauges as you nip it up. After that gas tightness of sensors and donut joints into the cats are next