Too much fuel being dumped into the engine or ignition timing is late and the fuel is finishing burning in the exhaust manifold instead of making power in the engine. If there's too much fuel, you should see black smoke from the tail pipe and the Check Engine light should be on.

Answered by caradiodoc (expert)
17,285 answers provided

Which manifold ? left right as per carad... check engine light on

Answered by Docfixit (expert)
18,443 answers provided