I have yet to check the MAF sensor and I am not sure why, through checking the wires, plugs, vacuum hoses etc, I must have glazed over it somehow. Now that it is summer I no longer need to run the engine for 15 min, I just turn her on and go (very convenient). In the spring I used a fuel line cleaner called Royal Purple and boy what a difference. The main thing that I find with my engine is that either burns too much fuel at times or the idle is a little bit off while I’m stationary at a traffic light. Sense using the product Royal Purple my PVR is running wonderfully but she does still have a rough idle at times when stationary.