1998 Pontiac Trans Sport Questions

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The car runs good except for idle,I replaced the IAC sensor, cleaned the MAP sensor, Ineed to but didn't clean the throttle plate, seems like it is gummed up around the edges.
Slippage when comparing input shaft speed to the output shaft speed. Is this expensive to fix? I'm trying to find out the average cost of repairs including labor. I'd appreciate any help:)
Fuel filter has never been replaced. Where is it located, can I DIY?
there is no spark and can not here the fuel pump come on when you turn the key
suspect wiring between relay and pump is bad, maybe a bad ground, but need a schematic to know where wires going so I don't wreck low voltage side of circuit. popped fuse once. any ideas?
I've already replaced the fuel pump relay
cant change from one to another it is stuck in park is it expensive to fix
When I try to start it it turns over but is not firing
I still don't have heat in the back but I do in the front.
Vacuum hose diagram
Is this a sensor problem and if so where is it located?
Before I put my van in the shop my "check engine soon" light came on. I didn't know at the time what for, I was already going to put it in the shop for a complete rebuild. Just had the engine rebuilt, idles smooth as ...
Where are the rear a/c fans on my van located. The only fans i see are the ones that are in the front by the radiator. Some one help me out with the rear fan loctions?