A car that I'm looking at has aftermarket motor mount inserts (front and back). Because of this, at idle there's quite a bit of vibration. However, at around 1k it's fine. So...would I create any problems if I raised the idle to 1k by adjusting the idle screw on the t-body?

 

You might use 1% more gas.

It wouldn't cause any other problems...

 

Don't go any higher than that or you could get an idle surge loop going. Fuel injector cutoff with the throttle plate closed starts somewhere around 1100-1200.

 

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wtf is this