Join Date: Aug 2011
Location: Fowlerville, MI
If you've checked everything over, and read for codes, it probably just needs plugs. If the intake looks like its coated with oil inside, cleaning it all out may help out a bit. A map sensor and air temp sensor won't read right coated with oil. Just don't scrub them, spray only. You may want to test the throttle position sensor, too. It wont throw a code till it dies or shorts internally, but may still have bad spots in it.
And with all this said, your cats may be bad. They can really bog an engine down.