2000 GMC Savana 1500 Questions

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sometimes cuts off when backing up, slight smell coming from exhaust.
I want to be able to seat another person in the van
I replaced fuel pump fuel injectors distributor & major tune up& map sensor i noticed air intake hose was missing u can hear the vacuum sound i replace the hose in my van it ran for a cpl hrs & wouldnt start back up i dont no whats causing this problem! It would still stall out cut off after the repairs it still gave me problems when i press the gas it would cut off or back fire & lose pressure no check engine lights on or nothing
:key on=48psi then slowly drops to 43psi (takes 10 seconds). Engine on=54psi/idle, rev it up & drops to 48psi, let off & back to 54. Will crank, won't turn over without starting fluid. 130k miles, daily work vehicle. Changed: distributor cap, rotor, plugs, wires, tbs, speed sensor, battery, o2 sensors, fuel filter...checked all relays/fuses..scan showed p0308 & bad o2 sensor was all. I have a new pump, I just want to make sure before I make a $300 mistake.
Front air is working. Back air is not working. Possible valve repair/replace?
has new battery and starter
heater blows hot air but gauge measures lower than normal when engine is hot
It will then restart
The driver's outside door handle started to pull away from the door. I bought a new one, but I can't figure out how to get the old one out and the new one in.
How do I remove the current Lock Cylinder and replace it with a new one. I can put key into key the lock cylinder and it will turn to the on positon that also unlocks the steering wheel but that's all it does. It goes to the on and even start position but there is no resistance to the assembly like you would normally have when starting the care. The cylinder turns with the key freely
my reaar shock brke thro the frame mount
Speedometer Jumpy...Check engine light on...tranny slips and misses at heavy acceleration...
Could these symptoms occur from a bad/faulty/dirty speed sensor on transmission
What would the average cost to replace window motor for drivers side window?
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