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Originally Posted by gttouring
Funny I have a Volvo 122 now and the SU, i think may be the source of the trouble
A cold full throttle stumble, after it warms up it all good, but until then
pop pop pop crack poop gurgle vrooom!
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You may have to run thru some of the steps I have outline at the beginning of the thread.
Sounds like a set of dry dash pots. Unscrew the black knobs and put a few drops of motor oil in. Do not fill them as the oil will only squirt out the vent hole.
Next step would be remove the air cleaners with the engine of and see if you can lift the pistons with your finger. If they do not move freely, undo the screws (2 or 3, depending on model) that hold each dash pot bell in place and carefully lift the assembly out one at a time and inspect. Check for free movement of the piston. Could need a cleaning inside the dash pot bell. If it is free check for condition of needles and insure they do not have wear marks near the piston face.
