I have a Buick century 3.3 v6. Has some hesitation problems. I've bought iac. Tps. ECM. Maf. 1 coil pack. Icm. And more. Hesitation happens all different times of day some times when cold sometimes when hot. Sometime not all day. Usually I start it up and it takes off great then the next time I stop that's when it starts. Any ideas? Also I bought the iac and they say with it plugged in and car on the pentle moves, mine doesn't not the old one or new one. Connector has 4 wires 2 have votages of like 12v other 2 have like.60v? And where should the tps be adjusted to?