I just washed my car last thursday and when I got home and turned the ignition off, the engine dieseled for a bit then finally quit and there was a hiss like steam evaporating. Ever since, the car diesels after about 30 min of driving and the idle goes from 800 to 1100 RPM there are rough spots at 1000 and 3000 RPM... I have no idea what is wrong... it used to idle nice and smooth at 700 RPM. My question(s): Is this fuel delivery related? ignition related? or something else? I took apart the distributer and there was no water in it. There is no conductive gel on the contacts, but I wouldn't expect this to be the result...

Thanks in advance

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1984 Firebird - Daily driver
305 LG4, T5 - Hurst Short Shifter
Edelbrock 600 CFM Performer Carb - 14X3 K&N Open Element Drop Air Filter
Gutted Cat... gonna need a cat-back for next year
IROC 16x8 Wheels
Goodyear P215/60/R16
AIWA Bargain Basement (from Sears of course) CD Player

Quote from my sister:
"It sounds like a boat"

Special Features:
Non-functioning parking break
Non-functioning rear hatch pistons
Broken heater ****
Disconnected engine computer that continually says check engine

Future plans:
New Paint - take out two small rust holes
Reupholster the ceiling (bare foam now)
Highflow Cat-back exhaust
Dual 12" Subwoofers, real speakers in place of OEM