J
John M
Guest
1993 cadillac seville. 4.9L. started to notice the tach bouncing around a time or two the past couple of days. only did it for a few seconds. over the course of past several months, ive replaced a lot of stuff (idle speed control motor, fuel pump, fuel filter, TP sensor, ignition coil, hall effect switch, did plugs/wires/cap/rotor today, and some various other sensors). it started having similar problems about 3 weeks ago. quickly got worse till it shut off due to a bad ignition module. replaced that, ran like a top for the 3 weeks. now its kinda starting to do the same thing. it almost acts like the timing jumps off a little. the tach jumps around for a few seconds, and i can feel a slight pull on the motor, and if i stop, the idle feels erratic. then it will straighten out and ride without a problem. so if anyone has an idea, or thinks of something i missed, or has a can of gas and a match i can use, please let me know. much appreciation for any HELPFUL responses. thanks