Erratic idle issue!
So im pretty handy with cars but im not sure where to start. I have a 3.0l flex and it just recently had a tune up new plugs and wires ran great for the first 10,000 miles now it seems to be stuttering at idle but it will only do it when its been running for a few hours straight and as soon as you give it gas it settles out but as soon as you go back to idle it starts stuttering again. The camshaft synchroniizer was replaced about 30,000 ago.And im not sure if its related but twice ive gone to give it gas and as soon as it shifts to second it stalls but that hasent happenned in a while im thinking maybe the fuel pump is starting to go but my tuner shows steady fuel pressure even when it acts up so i wanted to get some more opinions before i just throw parts at it! any info is appreciated thanks!
New DD-2009 Ford Mustang GT/CS candy apple red.
(sold)2003 XLT Tan 3.0L V6 5-speed, Lots of mods.