There are quite a few things that could cause this.
#1. Check the Power Transistor Unit. (located on the intake manifold generally) This provides signal to coil from ECU and also provides RPM for tach.
#2. Check the Coil Pack.
#3. Your ECU might be taking a dump. Get it tested.
#4. Bad ground or a short.
Copyright DSMFAQ (Chuck Lavoie) / 1000AAQ (Sean Costall) 1989 - 2021
Site seen by 899130 visitors