2000 Pontiac Montana Questions

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so I replaced batter, timing set, and starter. all new parts and have no change in cranking speed. I am at a loss and out of money now. any help is appreciated
Transmission will not shift into second third or drive
I have a 2000 Pontiac montanna and its winter and I think my fuel pump went out I don't want to drop the gas tank, is there a way to get to it from inside the van..under the seats?
It has many miles and the motor is getting tired. Under power and in gear it started to fall on its nose, loose speed. In park or neutral you can throttle up and all. But under power and in gear you can not get over 2000 rpm and around 25-35 mph. Up hill maybe 10 mph. Thought maybe catalytic converter was plugged and drilled 3 holes in the side of the converter. It is doing better but only 10-20 %. The time from fine to only short runs ( less than 20 blocks or so ) was about 3 months. There was a slipping of the transmission prior to current state.
. Someone said it may be the coil packs too. I need better input I van not afford to take shots in the dark.
and pads replaced, balanced wheels and tires and it still does it.
no brake lights, tail lights, turn signals, or back up lights. the light around the license plate work fine. and so does the light above the rear hatch. everything worked fine yesterday out this morning. when headlights are on the turn signal indicator lights remain on.
it wont roll up..
Already replaced the fuse by passenger door,15 amp, and looked under hood but don't know what those big fuses control. Need my power to work.
I thought battery in keys was bad so changed that not it because slider doesnt work with button inside vehicle either.
Rear back seat won't come out
It does do the bucking around as I am driving, everytime I drive. nothing major with the van other than this,need some good insight on this
when you start the car the oil seal will fail on the filter. I have used several brands, does this on all brands. was told it was a pressure relief valve. replaced the pressuer relief valve in the oil filter area. It still blows the oil filter seal. need help.
The van will go from a cold start to all the way to high temp on the gauge and will start to run rough when it gets to high temp. It will then go down to normal range of temp and will run fine, and then go will back up and back down. I have 3 things that I am thinking it is, but not sure which one it could be.
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