Hard Jerk When Driving
I have a 1991 4Runner 3.0 5 spd. When I am driving on the city streets or freeway I have a one or two second hard jerk and then continues smooth again. Doesn't do it wheeling only on smooth roads. No engine light as new tune up complete and 02 tested ecm, mass air flow meter, distributor, coil, no codes, added grounds and cleaned old ones. The next thing is to drop tank, installing new fuel pump and relay. I know everybody is going to say put a 3.4 in it. I have to make good with what I have. Any ideas?????