my 94 jeep laredo has a weird problem, when driving at highway speeds 65mph or higher after ten or fifteen miles the check engine light comes on, the truck don't drive any different or lose any power. i changed the catalytic converter, and changed the muffler just in case it was plugging and creating to much back pressure. but it's still the same. i brought it in and had a scanner put on the diagnostic port but the computer can't communicate with my jeep. i'm lost. it also will only idle at about 300 or 400 rpm. no higher. i put in a new tps but no change.
Apr 23, 2009 at 11:23 AM