[72mino]

I have an 06 HHR with the 2.2 ecotech and auto tranny, 145K, but the engine or at least the coil pack is from an 03 cavalier. I just bought it at an auction. The intake hose is missing (from the fender to the air box), but I don't see where that would have a major affect on it. It usually won't start on the 1st try, but does on the 2nd, misses for a few seconds, then idles smooth. It drives fine as long as you don't get on it.
As I said in the title it won't rev over 4000, but I found out by accident that if the MAF is unplugged it will, so I replaced it and it didn't change anything. It is also only getting about 17MPG around town, which seems low to me.
I thought it might be a blown head gasket, but I did a compression leak down test on each cylinder and the only leakage I have is a little by the rings I hear in the oil fill hole. I also did a compression test and got 185-195 psi in all cylinders.
My code reader won't read the codes on it for some reason, but Advance Auto's will. There weren't any codes that seemed relevant, but I reset them by unhooking the batter after I checked compression, & leak down. I will go back in the morning and have them check again to see what came back and post them.

Any suggestions would be appreciated.

Dustin