Runnng hard and fast? I am assuming you mean the RPMs stay up????
You say it starts up fine...the rpms should be high when you start and then once warm, the rpms should fall. It seems you may have a problem w/ your carb and the high rpm kick down once warm. Hot air choke? Is the tube from exhaust manifold to air cleaner in place? There is also a little tube that runs from choke coil down inside the intake and loops back up....the help warm up choke--near the egr.
carb idle adjustment correct? It should be a little screw on your carb linkage on the carb intself....ever try turning that down (turn courter clockwise) to get the rpms low?
Next thing would be vacuum leak. That would cause increased rpms. spray wd40 all around the engine gaskets/vacuum hoses to try and find a leak. If rpms jump up w/ the wd40 spraying, you found a leak.
It could be your timing. Do you have a timing light? If not, you could loosen the distributor hold down bolt and play w/ the distributor a little at a time. Turn dist. counterclockwise to advance the timing and see if rpms go down. If so, don't do this too much w/out testing the performance. Make sure the engine doesnt knock when doing this under high acceleration under load--if so, back off a litte (retard the timing--turn clockwise).
SgtDel
aka "Andy"
www.delbridge.net
1979 Big 10 383 stroker
1991 Blu 'Burb 3/4 ton 4x4
1
