MAP and MAF affect fuel delivery. IAC controls idle speed. Try running with the MAF unplugged. This will force the PCM to stay in open loop. IF the engines runs better with the MAF unplugged, it is a good sign of a bad sensor. It could be the MAF, but could also be another sensor.
FYI, Both the MAP and MAF are used to measure the amount of air going into the engine. The MAF actually measures the amount of incoming air, while the MAP measure engine vacuum and the PCM then calculates the amount of air going in. The MAP sensor is only used at start up time, or when the PCM is in open loop mode. Once the engine is up and running, the MAP is disregarded, and the MAF is used. However, if the MAF is disabled, then the PCM goes into open loop, and uses the MAP.

 

Your car doesn't have a MAF sensor. MAP sensor is a good suspect though.

 

I noticed the MAP connector was a little damaged. The MAP sensor worked fine in the firebird I took it out of. However, the connector was damaged a little when I replaced the intake. I'll change the connector and see if that fixes it. Fingers crossed.

 

I changed the connector for the MAP sensor and still have the same issue. At this point, I'm thinking spark plugs. I can smell the fuel. It's not firing on all cylinders.

If it's not the plugs, then the injectors might not be seated right. But I don't see how since the intake won't fit right or bolt on correctly if the injectors are out of alignment.

 

Need some help here guys!

I replaced the plugs today. They were fouled! I also replaced the IAC valve. Car starts and runs good when cold. If I shut it off and turn it back on, then the car runs rough and rich and will stall and die. Last thing I can check is the vacuum lines. If that's not it then are my injectors shot?

 

ive read that seafoam can foul plugs depending on the carbon in the engine. That could have been the cause. Seafoam can be a blessing, but i've also read a of a few people who have used it on carboned engines and it messed up plugs, wires, cats. Depends on how bad it was.

 

Before going off and buyinf all new injectors get a noid light kit and make sure the computer is firing them and not leaving them open. The CMS is the primary sensor in telling the computer when to fire the injectors. If the CMS is not reading right or not plugged in the computer will fire all 6 at the same time based on the CKS readings. Oh and the CMS is right on the top of the intake manifold under the T-stat housing so you prolly did mess with it when you did your upper intake and stuff.

Massey

 

Which sensor is the CMS? Coolant Temp, Crankcase? AllData has different names for them.