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My 73.5 does exactly these things! (Takes a few cranks to catch, usually with a backfire, then either immediately stalls after firing up, or putters into a VERY low idle (200-400rpm) and slowly works its way to 1400rpm (takes ~10-15 seconds), then goes into normal warm-up routine. Drives fine after that. Settles back to 950rpm idle when warm. I do find using a bit of foot throttle is better than using the throttle lever. I only use the throttle lever to let the car warm up at a higher rpm once it engages.
Does this indicate an air leak?
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'76 912E
'73.5 911T
'72 2002tii
'88 M3
'17 Mini S
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