79 cougar stalls when put into gear?

Asked by Billy May 18, 2020 at 01:31 PM about the 1979 Mercury Cougar

Question type: Maintenance & Repair

We have tried looking for a vaccuum leak cant find
one replaced plugs wires distributor intake and
carb also transmission modulator. It seems to
need to run a high idle (1500) and it wont stall.  
The timing is dead also.  We have been fighting
this issue for about 2 months now since my
mechanic can only come over every saturday. Any
ideas or help would be greatly appreciated

2 Answers

Billy answered 3 years ago

It was running ok but now the carb is backfiring I'm going to try to put a new carb on and see how that goes we replaced the transmission modulator as that was bad so I can see about draining tranny fluid before the new carb thank you so much for the input by the way I'll keep you posted

Mark helpful

GuruJ3SNY answered 3 years ago

I would replace the idol control valve. A vacuum leak could be your culprit. They can be a real challenge to find. I've had them underneath on a elbow thats made bigger on one end than the other. I wish I knew what its called but I don't. Good luck

Mark helpful

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