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?
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
Tips for a great answer:- Provide details, support with references or personal experience .
- If you need clarification, ask it in the comment box .
- It's 100% free, no registration required.