aarcuda, Joe, Rob, and all: Sorry for the belated reply, herre's an update on what little progress I have made in the interim: I have replaced 4 of the 6 spark plugs including the #5 plug (passenger side rear) All passenger side plugs are replaced. I also replaced the #5 spark plug wire. I have also replaced the air filter and ran a couple of bottles of "injector cleaner" thru the gas tank. I am still getting the original three codes: P0300 P0305 P1294 I replaced the PCV valve this morning and noticed that the hose to the PCV valve looks like it needs to be replaced. It has some cracking to the point where I suspect it may be leaky. Could this be causing the three codes? I will replace it ASAP. Thanks in advance. Tom