I would start with the easiest and work my way back ?? check timing .. air filter .. leads etc. etc.
Rough Idle, Missing or Stalling
Incorrect curb idle or fast idle
Incorrect basic timing....Reset ignition timing Improper idle mixture adjustment..Reset idle mixture,
Improper feedback system operation..Check feedback system
Incorrect spark plug gap...Reset spark plug gap, Moisture in ignition components..Dry components
Loose or broken ignition ..replace ignition wires
Damaged distributor cap or rotor..Replace distributor cap or rotor
Faulty ignition coil...Replace ignition coil
Fuel filter clogged or worn...Replace fuel filter
Damaged idle mixture screw...Replace idle mixture screw,
Improper fast idle cam adjustment..Reset fast idle cam adjustment,
Improper EGR valve operation...Replace EGR valve
Faulty PCV valve air flow...Replace PCV valve
Choke binding or improper choke setting...Reset choke or eliminate binding
Vacuum leak...Repair vacuum leak
Improper float bowl fuel level...Reset float adjustment,
Clogged air bleed or idle passages...Clean carburetor passages,
Clogged or worn air cleaner filter...Replace air filter
Faulty choke vacuum diaphragm...Replace diaphragm,
Improper distributor spark advance...Check distributor operation
Leaking valves or valve components...Check and repair valvetrain
Improper carburetor mounting...Remove and remount carburetor
Excessive play in distributor shaft...Replace distributor
Loose or corroded wiring connections....Repair or replace as required
Nov 12, 2008 at 8:05 PM
