- Mar 1, 2007
i am running a VPC with keydiver chip. I was having problems with the car bogging down and jerking alittle under boost which i figured the map sensor was going. So i just replaced it with a GM 3 bar map and it made it worse. i can barely even make it up a steep hill now. It is wired up correctly, would the settings on the VPC/GCC cause this if they were way out of tune? It worked fine before exactly as it is now, then just started to bogg and jerk under boost so thats why i replaced the MAP. what else could be causing this?