I drove the '69 for the first time in about 6 weeks tonight, both times when I shut it off it diesled a little bit. I figured bad gas, and it was almost empty so I filled it up with premium (that was a small fortune), it still did it, any ideas?

Thanks,

Matt

 

Idled too high, vaccuum leak somewhere, timming out of whack, bad fuel, running a little hot. Takes yer pick!
Most likely, if you drove it for a while after refueling and it still dieseled, then you may have a carb that's not closing properly. Does it seem like the idle is a little higher than normal? A gummy throttle plate could cause this, as well as a vaccuum leak. For some reason, the engine is still getting air after turning it off. That's the most common reason for dieseling.
If the timming was off far enough to do it, you would feel the drop in power, or you would hear it "pinging"(detonation). You didn't mention this, so I would assume that's not the prob.
I'd check for the correct idle speed, adj. the carb if necessary, and check for vac. leaks.
You also didn't mention that it was running a little hot, so I wouldn't think that was it, either.

Also, if this is an A/C car, is the solenoid for the idle speed working? It should allow the throttle to close completely when the key is turned off. If it doesn't, then the idle will be too high. Adams' Apple38572.8273958333

Thanks Joel,

It's not running hot (180 degrees), it's not pinging and it doesn't have A/C, so I'll look at the carb and for a  vac leak.

Thanks,

Matt

id clean the carb up, check for vac leaks, then run some water through the engine as has been discussed in numerous threads here to blow the carbon out..