Car Problem: Pontiac Grand Am 1996 3.1L, cylinder #1 misfire?

had it hooked up to a diagnostic computer, the computer read misfire in cylinder 1 in idle and when revved.. 3,5,6, misfired too so i replaced all the spark plugs and wiring to the spark plugs and made sure to put it in the right firing order, but still misfires and cuses the engine to rev up and down.

plus its hard to start need to pump gas to get it running and at stop lights need to keep the foot on the gas some times to keep it running.

the mechanic whom works solely on fords told me its ether a bent rod or a plugged injector, i agree with him on the bent rod but injector i dont know i really think it's a computer control problem but i have no clue......

and the evaporator line was broke from old rubber pipe and fixed. all vacume lines checked and working to my knowledge.

NO NEED TO READ THIS PART: this is the story about the car: bought the car around 2 years ago for 2500...(got ripped off i was a first time buyer)... about a mouth after i got it the thermostat for the radiator went heated to the point where the radiator cracked and had to get a new one and a water pump cost 1200.00 to fix then the a/c went out at this point i wanted to kill the guy who sold me the lemon.
but i kept driving it around from 94000 miles when bought to 115000 now and this ship happens and when replacing the plugs i found out the car had been running on 5 cylinders for the last two years because one of the spark plug wire was unplugged (#5 cyl) and now i feel like if i found the guy walking down the street i would probably brake his legs but i really wouldent just saying i probably would tell him Carma a bict|-|.

thanks if you could shed any light on this problem :-)
 
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