I have a 1989 YJ with a 4.2L engine. In the early morning , it starts easy and the RPM's come up right away. But after a minute, it idles so rough, it sounds like it is firing on only 4 cylinders.
After it gets up to temp. (approx. 170-180), it runs fairly decent, starting out, and fine at higher speeds. At stop lights, if idles rough, and after stopping, it restarts hard, and requires multiple cranking efforts. I have replaced the plugs, reset the timing, and adjusted the idle down to a lower RPM. It has an MSD ignition and a Clifford Performance intake and Weber Carb, with Clifford headers and a mild Howard Cam. I can't find the problem. Help!!
After it gets up to temp. (approx. 170-180), it runs fairly decent, starting out, and fine at higher speeds. At stop lights, if idles rough, and after stopping, it restarts hard, and requires multiple cranking efforts. I have replaced the plugs, reset the timing, and adjusted the idle down to a lower RPM. It has an MSD ignition and a Clifford Performance intake and Weber Carb, with Clifford headers and a mild Howard Cam. I can't find the problem. Help!!