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Only when the defrost is turned on the engine surges back and forth. Why

(1990 Chevrolet 1500 Pickup)
in Tacoma, WA on October 20, 2012
This only happens on defrost cycle
Displaying 1 answers & 0 comments
Popular Answer
on October 20, 2012
ac compressor is on and may be cycling on and off. check it to confirm

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