My gt started smoking a while back and after running diagnostics I ended up replacing the oxygen sensors. The smoking problem seemed to be fixed the entire day after I installed them. When I started it this morning it smoked for about a min and then cleared up. Now it idles low sometimes and shakes the car. Also when I accelerate it is very jumpy and not smooth at all. What could cause this. I bought some fuel injector cleaner thinking maybe it was the fuel injector cleaner. I havent put it in yet cause i want to fill up with 93 octane and add some octane booster also to clean it out. I appreciate all the responses.

 

Check your plugs-if you got as lot of mileage on them, might wanna change them-secondly while you're doing this, check the coil boots too-I had this problem for the past month-thought it was a fuel problem-not even close though-two boots were cracked, so the spark was arcing off the head.

 

my car did the same thing get some BG 44k fule system cleaner its the only stuff that i have tryed that actually worked