How many miles?? ...Have the O2 sensors ever been changed?? ...Check the plugs...Maybe a bad cat...
...You dont give much info to go on...So, its kinda hard to pinpoint a cause...
...Has there been a loss of power?? ...Anything else strange happen?? ...You mention two mods...How long after adding them did the problem start?? ...Any additional info would be helpful...
...You dont give much info to go on...So, its kinda hard to pinpoint a cause...
...Has there been a loss of power?? ...Anything else strange happen?? ...You mention two mods...How long after adding them did the problem start?? ...Any additional info would be helpful...