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Phil,
When facing the engine on your car, is the #4 cylinder on the right side, closest to the fron of the car? If so, I had the same problem on my '73. I had the "pop", and I had jerking. The pop was fixed when I had my gas tank boiled/coated, my hard fuel lines flushed, new fuel filter installed, and a new fuel pump installed. I had a lot of rust/garbage in my lines. Anyway, the pop is now gone, but I still have the jerking after the car warms up(after 5 minutes or so). My car also has a low idle. In fact, it quits sometimes when I depress the clutch to stop at a stoplight. I think this can be fixed when I adjust the idle on the MFI rack. Of course, I need to by the MFI tools just as you do, along with a stack air flow meter. Make a post if you get everything adjusted properly. I'll do the same if I get everything squared away before you do.
Bill
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William Armentrout
1973 911T
2.7 carerra rs specs
www.geocities.com/william_armentrout
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