Check engine light comes on, P0300 multiple misfires is the only code. If I watch the misfire counter on the scanner while the engine is running, only cyl's 1, 3 and 5 show misfires. There is no noticeable roughness at idle or under a load. The only symptom is the MIL which sometimes flashes at which point causes some kind of limp mode and the trans. won't go into overdrive. I have done the usual checks, new plugs and wires, new ignition coil, cylinder compression is good all around. Are leaking intake gaskets an issue on these things? Wouldn't a lean misfire set other MIL codes? Please help, I need this junker to get us to Florida in a couple weeks!

 

Compression test is next. Also, read this post on multiple misfires

http://www.ricksfreeautorepairadvice...10-p0311-p0312

 

http://www.obd-codes.com/p0300

Hmm, 1,3,5 all on the back bank of cylinders. Not ringing my bell but it sure seems like that should mean something.