Bad64chevelle

Lately my 94 Z28 hasnt been feeling up to power not to mention that i just broke my tranny mount and the rear is on its way out. I have a few questions.
1) When I put the vortec elbow on the intake i hace to thread the IAT. The little black plastic "fingers" on top broke. If the IAT was bad would I lose performance?
2) My Low Coolant Sensor is bad, and I just disconnected it so the light would go off. Could that cause a problem?
3) My "rigged" cold air, Im not sure how good it is, and if it is leaking on not. But i will be buying a Lingenfelter CAI soon. Would my really bad hack job of a cold air intake cause problems?
4) When I let the car sit for a week or so, and start it. Ill turn the key like normal, and it wont fire. I turn it again and it starts but is sorta choppy for like 5 seconds then cleans out. Injectors?

A few background notes. New plugs, wires, O2's, Opti, MSD coil, and the mods in the sig. Any ideas? Thanks If you need more info just let me know!

Jon

OBE1 95Z28

If you have a leaky intake track, that will definitely hurt performance as unmetered air (MAF can't see it) will cause you to run lean. Your starting problem is probably due to a discharged battery.