Car seems to buck with defrost on

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Cantslowdown said:
My car seems to kinda buck almost like its missing but only dose it when the defrost is on it dose it sometimes at idle and even just driving down the road..I was thinking maybe iac..

Clean the IAC and the MAF. It that doesn't help, replace the IAC. Also replace the PCV and grommet. The TPS could also be the culprit...
 
Sounds like the AC compressor cycling to me.
With the eng on and set up the same open your hood and watch the AC clutch, it the stumble happens when the clutch engages you have found the cause. This is normal operation.

Dwayne
 
Cantslowdown said:
My car seems to kinda buck almost like its missing but only dose it when the defrost is on it dose it sometimes at idle and even just driving down the road..I was thinking maybe iac..

by defrost do you mean the rear window defrost, as in the button to the left of the steering wheel? cuz that would have nothing to do with the compressor... but I also have no idea why using it would cause stumbling