2005 Pontiac Grand Prix GT engine size 3.8
2 Answers
I cleaned the throttle body on the engine I changed the spark plugs and wires I am still having a lot of putting in a loss of power it's a brand new battery I need to know how to fix the problem and my transmission seems to be slipping
Scan for trouble codes and test fuel pressure if you haven’t already. Check the catalytic converter to be sure it’s not plugged. Spend some time going through the electrical system making sure grounds and connections are all clean and tight.