I got a code p0172 and mine runs rich when it warms up and fine when its cold..........if it idles to long it wil say misfire Cyl#4.... MAF???? no one seems to be able to figure it out

the misfire cyl 4 code only comes up if I let it idle for 10 minutes if I start it and drive it doesn't come up

denso coils yes and NGK top of the line plugs yet has made no real change, intake gasket made a big change yet it still has a misfire, maybe I can video record it and post it, almost sounds like the intake is leaking internally on each #4 intake stroke, unless the mechanice screwed up or didnt reall...

*update* so MAF looked clean but after reading on this forum I sprayed it with Electrical Contact cleaner because I had some............noe both trim are in the negative -16 and -17 respectivly so I'm to assume it was the MAF sensor, or is it reading correctly and telling me I have a vaccum leak som...

OK so...had and exaust leak, took it in and they put from the manifold back to the muffler including the cat, a couple days later the engine light came on, cyl 1 and 4 misfire, I have never changed the plugs so I did that, ran better, then on idle light comes on Misfire code cyl #4, found bad intake...