77 911S CIS.
Having a problem with the car almost stalling out, as if it's fuel starved, then kicks in about a second or 2 later and gives a little back fire and runs fine.
Happens at all speeds and usually during acceleration, although I have noticed it at times when I'm not accelerating.
The car jerks hard as if it's going to quit right there on the spot, then will kick in again and run ok. This can happen a few times in a row, then will run fine for a 5-10-20 minutes, before doing it again. Then I won't notice it for a day or two, before happening again.
I have noticed a small backfire when up-shifting and during hard acceleration, right at the point of engaging the clutch. Although this is not happening during the stalling out problem, I thought possibly it could indicate I'm running too rich, which may have a relation to the stalling out problem?
I bought the car about 9 months ago (66k miles) and had a pop off valve installed in the first week or so. I know those can cause problems occasionally, but this stalling problem just started up in the last two weeks.
Any ideas to help an amateur mechanic?
Thanks!
Ken