fwiw, when I recently removed the intake to replace the valley pan there was not ANY deposits on the intake valve stems or intake path. this 4.4 had 100k miles on unocal or chevron 91 octane (sometimes 89!). I have not put in a bottle of redline fuel system cleaner in about 30k miles. I also changed the OEM platinum plugs there were worn but no signs of fouling or detonation.

you don't need to clean your MAF sensor if you have good air filtration. you can alway use the mass air sensor cleaner spray.