New Head and new problems

[1983 300 4x4]

I just replaced the old head on my 4.9L because it was carcked about a month ago. Now two weeks ago it started struggaling to idle and accelrate.
I put brand new champion copper plus plugs in and gapped them at .042. With the new plugs it still run the same way with a black carbon build up on the plugs. Any ideas?? Thanks in advance yall.

[GREENBLOOD]

Originally Posted by 1983 300 4x4

I just replaced the old head on my 4.9L because it was carcked about a month ago. Now two weeks ago it started struggaling to idle and accelrate.
I put brand new champion copper plus plugs in and gapped them at .042. With the new plugs it still run the same way with a black carbon build up on the plugs. Any ideas?? Thanks in advance yall.

Choke may be sticking shut.

[1983 300 4x4]

I took the rockers off the new head and put the ones from the old head on it and it runs a little better (note LITTLE). I rebuilt the carb and cleaned out the choke it was drity but not the problem. My dad says it could be the timing or rings.

[1983 300 4x4]

Yestarday it would run but not idle. Now today it will not start. It's backfiring when i crank it so i need to change the cam, distributor or timing chain. Plus the rings. I bought it in late 05 with 156,839 miles it's now at 170,000 miles.

[truckdude239]

try running som ac delco plugs or ngks they are the one i found my ford likes

[POWERMAN 5000]

Really sounds like bad timing or a bad distributor, specially if the problem is getting worse. Pending on your funds buy a new distributor. Check for bent pushrods, what yr? If the distributor is good the timing might have got off somehow at the chain.