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Chevrolet Impala SS Questions

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it doesn't seem to have the power it had
I just bought this 08 impala ss, cause sounded simple fix. Oil high dirty but looks normal. Coolant low. 5.3 can get to barely crank with good jumper even on starter post. Then next time starter just engage and don't have enough power to turn engine over? Napa test starter good? Starter spins fine with no load on it. checked alternator is there anything else that could make engine so hard to crank? Few Plugs look nice tan. No codes in history? Maybe I should pull serpentine belt. Is there anything else to check before digging internally.
PUMP IS NEW AND JUST PUT NEW WIRES IN THE TANK. PUMP WILL ONLY PRIME ONCE IN AWHILE. NOW I AM GETTING A RUNNING RICH CODE
The key turns and the features come on but there's no turn over. She was having problems with the remote and after I changed her battery due to the cold and it being almost dead. When I hooked it back up the alarm was going off and the remote wouldn't disarm it so I turned the key and it came on but after shutting it off, it hasn't came back on since.
Start then stalling happens at ever attempt and the 2 to 3 sec. run time seem to be equal on every attemp
The problem normally happens if I have to make multiple stops which causes me to start and stop the car frequently. I know the problem is about to happen because when I apply the gas the car hesitates for about 2-3 seconds then vibrates; shuts off with the keys still in the start position and then finally the check gauge & oil pressure lights will come on. I know it has to do with something electrical or overheating because if I leave the car sitting for over an hour after this occurs, it starts right up and drives like nothing happens. when i take it to the shop they never find anything even though i explain when and how this happens. What could be the issue?
I have a new engine spark plugs also bought a new opti crank sensor and also have a brand new fuel pump I'm not understanding why when I accelerate on the gas it stall and it will cut off and it takes a while before it cranks back up the car was sitting for a little while but I don't understand what could possibly be the reason
I bought the car used. Ever since I bought it my traction control light stays on, my ABS light stays on, and the information center of the gage cluster says "service suspension system" the blinker also blinks really fast although all bulbs work. Also my power steering just suddenly stopped working wit no warning. And last thing is that the check engine light stays on and the code reader said misfire on cylinder 7.
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