any ideas why my 84 suddenly is running really rough ,tested compression good tried different coil , module ,map sensor,tps ,throttle body, idles okay but when rev it up and let drop back to idle gags and pukes then slowly smoothes out again , also new plugs ,wires, o2 sensor , timing gears? kinda thinkin maybe intake manifold leak any ideas would be great p.s. only about 90,000 miles total

Plugged exhaust (Cat converter)

Or a fuel pump going or a clogged fuel filter

took cat out ,fuel pump and filter only 4000 miles on

Second guess -- to many new parts But --- recheck timing and look for those leaks.

Take the distributer cap off and look at the pickup coil, if the insulation around it is gone it will need to be replaced. it should have a wrap of white tape like material all around the outside if any of that is missing, that would be my guess.


Steve

------------------
Technology is great when it works,
and one big pain in the ass when it doesn't



Detroit iron rules all the rest are just toys.

I drove to indy for the 30th anni. it was fine it started getting less power on the way home I just ordered a new pickup coil I see mine has a few cracks in the magnet also planning on replacing intake manifold gasket because I have a spare that I will polish up anyways

replaced intake gasket and tbi gasket compression test vacuum check still nothing found I am lost at why it's running so rich any help would be greatly appreciated

A bad CTS will make the engine run rich, and may not trigger a code.

put new cts in also .anyone know of a good way to check o2 sensor circuit? acts like not operating

If the O² sensor was not working you would get a code. There may be codes saved in your ECM without the light going on.

there is no codes stored and i can unplug o2 sensor while running no change

quote Originally posted by steve308: Plugged exhaust (Cat converter)

Sigh. If I had a dollar for every time this was inappropriately suggested...

as posted earlier the cat has been removed already