when my car is in drive its ok but when in park its idle to high what is the problem on 1991 Lexus LS400

and could that be the reason I failed HC emmision

Get Your Car Fixed at a RepairPal Certified Shop.
We certify shops based on expertise, quality work, and verified customer reviews
1 answer
POSS VAC LEAK, HAVE CAR SMOKE TESTED TO CK FOR VAC LEAKS