Nissan Altima Questions

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Car is sluggish no power espealiy when a/c turned on
Step on gas stuters a minute then slowly acts like normal till step on to pass. Fuel pump just changed . Not sure if it is fuel pressure regulator or what . Timings going to be changed once I get funds . Cause of mileage so it water/oil since is all kit but it's gas I'm working on now. Idea to what could be . Disabled need car running
If you bypass the starter it will crank but still will not come out of park unless you manually shift it with a little push button on the shifter any clue what the problem is
It was all of a sudden no signs or symptoms came out of store and it wouldn't crank or start and is stuck on park all the lights come on when i turn the car key to accept but when i turn it to start it the lights all turn off on the dash board
Basically I think it could be my crank shaft positioning sensor or my tps? I have more details but wont bore you with all of them right away...
Ac blows cold, but is making noises when parked, and stop and go driving. No noises when I'm driving in higher gears.
When MAF hooked up no start
When putting the car in reverse it made a clunk noise, tried a couple more times with same noise. I also noticed the 'service engine' light was on. Later in the day, didn't make the noise, however light still on.

Went to leave work couple days later, took couple attempts to get it started, when pressing gas pedal to the floor would only do about 20 mpg, after driving a little ways it finally started picking up speed.
Starts working after playing with buttons
Sometimes my shifter gets stuck trying to switch from park to drive or vice versa.
Park my car shut it off break Light won't go off.
Is intermittent noise, clanking type sound. Sounds like chain clanking
Engine turns over but won't crank or start.
Do i use regualar or premium gas
Need to check ac compressor has no power
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