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Greetings gents, i Need some opinions and suggestions on a misfire. 1987 RC 360, 727.

Misfire is inconsistent as some days are worse than others. Seems to be continuous, but does not begin to misfire until the 160 degree range. From cold to 160, no misfire at all. At idle under load (in drive with brakes applied), misfire is most noticeable. When you moderately give it the gas, most of the time it will come out of the mis, but this is not always the case. Once around the 205 degree range, sometimes the mis will disappear, again however this is not always the case. Very frustrating.

- New edelbrock intake manifold and Carburator avs 2 650
- Fuel system is completely new, sending unit, pump, filters, lines
- New proform hei style distributor which was timed at a shop (ballast resistor and coil removed)
- New plugs w/ Msd wires
- new ignition control module and ignition switch
-93 octane

Any help would be great

Thanks,

BP

 

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EP5270 said:
Greetings gents, i Need some opinions and suggestions on a misfire. 1987 RC 360, 727.

Misfire is inconsistent as some days are worse than others. Seems to be continuous, but does not begin to misfire until the 160 degree range. From cold to 160, no misfire at all. At idle under load (in drive with brakes applied), misfire is most noticeable. When you moderately give it the gas, most of the time it will come out of the mis, but this is not always the case. Once around the 205 degree range, sometimes the mis will disappear, again however this is not always the case. Very frustrating.

- New edelbrock intake manifold and Carburator avs 2 650
- Fuel system is completely new, sending unit, pump, filters, lines
- New proform hei style distributor which was timed at a shop (ballast resistor and coil removed)
- New plugs w/ Msd wires
- new ignition control module and ignition switch
-93 octane

Any help would be great

Thanks,

BP
How many miles on the engine? It doesn't sound like a bad timing chain but it's good to eliminate the possibility. Tonight, in a dark garage, while the engine is running, open the hood and look at the plug wires. If you see flashes moving along the wires, you got a bad set of wires.

If they look good, you may just have one wire that isn't on quite right. I'd recheck each one and put a little dab of dielectric grease on each plug tip. Make sure all the wires are in the cap too. Sometimes they feel seated but aren't quite in there.
 

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check the wire's firing order ... lean fuel mix  ( you say its ok when cold so choke add fuel )  failing coil (when  coil warms up , it changes , this happens )  3 possiabuiltys to look at anyway .... 
 
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