Engine Performance problem
1997 Pontiac Grand Prix 6 cyl Front Wheel Drive Automatic
I have a 1997 pontiac grand prix gtp with a 3.8 supercharged motor it was rebuilt internaly only but has 185,000 miles, was rebuilt at 95,000 miles.. the car ran okay when i bought it. i imediately got a fule injection cleaning and an oil change done on it, then did my own tune up.. after completing the tune up and driving it its misifiring badly causing the supercharger boost to skyrocket when it misfires.. i checked the wires and got top of the line bosch platinum 4 plugs, the old ones were covered in black soot. wires are correct and plugs are pre gapped nothings loose.. i have magnaflow dual exhaust if that makes a difference, most of the hesitation comes at heavier load or steady around 40 mph.. what coulda caused this? it also seems to lose power when i come to a stop the lights dim as well??
1997 Pontiac Grand Prix 6 cyl Front Wheel Drive Automatic
I have a 1997 pontiac grand prix gtp with a 3.8 supercharged motor it was rebuilt internaly only but has 185,000 miles, was rebuilt at 95,000 miles.. the car ran okay when i bought it. i imediately got a fule injection cleaning and an oil change done on it, then did my own tune up.. after completing the tune up and driving it its misifiring badly causing the supercharger boost to skyrocket when it misfires.. i checked the wires and got top of the line bosch platinum 4 plugs, the old ones were covered in black soot. wires are correct and plugs are pre gapped nothings loose.. i have magnaflow dual exhaust if that makes a difference, most of the hesitation comes at heavier load or steady around 40 mph.. what coulda caused this? it also seems to lose power when i come to a stop the lights dim as well??
Nov 29, 2009 at 12:00 AM