Miss under load first thing I would suspect is plugs and wires.
December, 7, 2011 AT 9:32 PM
Im thinking camshaft. Plugs, wires, rotor have been replaced and distributor cap
December, 7, 2011 AT 9:48 PM
If it only misses under excelleration I wouldnt suspect a cam shaft that should effect at all different rpms. Usually when it happens under excelleration its a igniton issue. Is it worse with the ac on?Also how about your coil?
December, 9, 2011 AT 8:47 PM
The truck backfires through throttle body (TBI) when under load. Don't know what to check next? Cam etc.