I have an 02 Taurus that bucks real bad during heavy acceleration around 45
mph (i.e. getting on a highway). The dealer said it was the AC compressor
AND the IAC valve and gave me a very pricey estimate to repair. It still
does it with all of the AC/heat controls in the off position and
everything I read says the IAC valve controls idle only. Any suggestions?
You need another opinionfrom another facility. At the speed
you indicate, the IAC is long since been out of the picture
and, the a/c would be in real trouble if if cause enough
bucking for you to notice it. I would suspect you have some
sort of ignition malady causing your bucking but, something
as simple as a dirty fuel filter can do that although they
typically cause reduced power more so than bucking.
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