Post by
scottydog »
https://forums.nicoclub.com/scottydog-u73341.html
Sun Jul 20, 2008 3:10 am
If it's idling rough yea it's not drivetrain.
Check the plugs by pulling each one by one. If it looks good then touch the plug to ground (insulated pliers) while someone turns the engine over. If each one has good spark your plugs and wiring are ok.
Pull each plug wire one by one and start the car. If one cylinder is running bad pulling the bad one won't make it any worse. If the bad cylinder has good plug and wiring then you have a bad injector. A bad fuel pump will not have any bad cylinders, just worsening as the rpms go up and the engine becomes fuel starved.
Injectors go out a lot in these old cars, are really easy to replace.