964 Engine Running Issue

[widebody911]

My 3.6L has started running funny, and it just came out of nowhere.

Symptoms:

• hard start - takes 2 or 3 seconds to get fired up
• won't idle for the first few minutes - have to keep my foot on the gas
• wants to die when I let off the gas; ie, driving down the freeway, all is well, but when I pull off the freeway and stop, the engine goes into some idle oscillations, then croaks.
• rough idle - there's a vibration at idle that's almost, but not quite a miss.

This started when the weather changed this week - it was nice and warm - mid 80's - for a few days, then suddenly dropped to the mid 60's.

I run Techron thru it every now and then, the last time being early last week.

Any clues? I've done the obvious hose-and-connector checks. I'm still really new to these engines.

[porsche964]

does this 1977 3.6L have the same DME at the 964 series? I had a problem like this; when I replaced the DME relay, it was cured. Also, could it be that your dual-distributor belt has snapped?