Chevrolet G Series Van (G20) Questions

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I can't go faster than 35-40 mph. I have to give it a lot of gas just to get it to shift into 2nd & 3rd. It has plenty of Trans. fluid. Could it be a something simple or is my transmission failing?
van will not idle without pumping the pedal,,,will stall trying to go from park to any gear. This problem has drained the battery...i replaced the fuel filter, fuel pressure regulator, map sensor, throttle position sensor, vaccum lines, battery and alternator,, im thinking it may be an electrical "grounding" problem but cant find a wiring diagram or schematic it,,, OBD1 codes49,51,53 and 54 came up,,, any help would be greatful
Was slipping going n 1st but I'd let my food off the gas when I hit 20 25 n it would shift the one day I hit the breaks really hard n now can't get it out of 1st gear n my having some electrical problem speed themter ain't working head light dem out
Transmission was slipping going in to1st gear but would left food off gas then it would shift I hit my breaks really hard one day n the the van wouldn't shift out of 1st gear
The drivers side moves slightly but not much , passengers side not st all , I cab hear them both click when trying to engage them , what could be my issue ? Please help
How to fix a no spark issue
Cranks and wants to start but wont
how do I disassemble the dashboard to get to the vent assembly compartment
I was changing my switches & accidentally touched my wires together, now my rear interior lights & tv won't come on. I can't locate the fuse.
I did jump the starter over and it did crank but wouldn't disengage
does it all the time but when it gets going it rides ok but i hear noise under van like converter could it b that
Just cut out on highway. Fuse OK.
I recently had the automatic transmission rebuilt. The engine revs and the transmission does not shift out of 1st to 2nd until 20 MPH. The tech says this is about correct. I sense that the engine is reving too much in all the gears when shifting up. What are the approximate proper shift points from 1st to 2nd, 2nd to 3rd and 3rd to 4th in MPH?
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