Having problems with your 1999 GMC Yukon Denali ?

I have a 99 gmc yukon denali. it has a multiple cylinder misfire, uses coolant, no visible leaks. and my spark plugs look black. i have gave it a full tune up. (plugs,wires,cap,rotor,and coil.) i am thinking my problem was head gaskets or intake gaskets. i have also replaced the upper intake. what is wrong with my motor?

Posted / edited by AnonymousUser on : 18-06-2018

Answers :

Very common the intake manifold gaskets leaking. I've replace tons of them. They can **** air internally and cause a misfire.
Repair Help & Product Troubleshooting for 1999 GMC Yukon Denali

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