So I replaced the cap and rotor on my 89 4.0, also beefed up the ground by the dipstick and ran a better vacuum line to the throttle body.
Since then she runs great, unless on a bumpy road. After a good bump the tach drops to zero then power returns.
It only happens on bumpy roads so it's hard to troubleshoot where I am. So far I checked the coil pack and all the plug wires, checked and reinstalled the rotor cap with no change. Any ideas? Summer is coming I need my jeep
Since then she runs great, unless on a bumpy road. After a good bump the tach drops to zero then power returns.
It only happens on bumpy roads so it's hard to troubleshoot where I am. So far I checked the coil pack and all the plug wires, checked and reinstalled the rotor cap with no change. Any ideas? Summer is coming I need my jeep