missing

[Nate Goodman]

Hi folks,

heres a question for all you: what would cause my stock 48 plymouth to run perfectly fine at idle, but as soon as you step on the gas, it starts to miss intermittently. The engine does rev up, but it just starts running really rough, sputtering and generally real un-happy sounding. Points? Vacuum advance? accelerator pump? any ideas? thanks.

Nate

[Normspeed]

Points, vac advance would be good items to check. Also the plug wires and plugs. Make sure the wires are firmly snapped into the distrib cap. Make sure the choke is opening. Is it something that just came up or has it generally been doing that for a while?

[old woolie]

I've had condensers cause these symptoms. Not on my 51 but on old farm tractors.

[claybill]

i would check everything connected to plugs and plug wires. its free and easy to check, and frequently causes a miss at 'load'.

bill

[Plymouthy Adams]

the quick check for condenser..if it idles fine...revs without probs but falls flat on its face under load is to check for blueish looking burnt point contacts..

[Niel Hoback]

When mine did that, it was because the vaccuum advance moved the breaker plate and shorted that little wire from the points against the housing. Odd, but check it anyway, won't cost you to look.

[Powerhouse]

sounds like your vacuum sucks...uh..in a bad way i mean. Check your timing for sure...do it by ear at fast rpms...

[Tim Frank]

I've had condensers cause these symptoms. Not on my 51 but on old farm tractors.

Me too. Had a number of British cars and Joe Lucas condensors were notorious.

[Nate Goodman]

It used to miss a little when warming up, but then it was fine. this is a new development-Thanks for all the suggestions.

Nate