Engine Performance problem
1997 Pontiac Sunfire 4 cyl Front Wheel Drive Automatic 112000 miles
ok I bought this car for my little sister had to put a new transmission in the car the case was cracked and locked up. I have been trying to figure out its poor performance for the last month. The car gets about 13mpg which I know is no where near what it should. I have a 96 cavalier that gets almost 30 and its in alot worse condition. The problem is that at 55 and higher the motor loses rpm and reves up and down constanly which makes it almost worthless to drive on the freeway. I have removed the converter to it dident look the best untill I have this figured out I took it out and straight piped it to see if it was the problem. I am so lost on what to try I am hopeing that someone will have had this problem and know exactally what to do to fix it.
have the same problem?
Thursday, September 2nd, 2010 AT 10:32 PM