Saturn LW300 Questions

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My 2001 Saturn LW300 seems to be hesitating when I am driving, I have recently changed the spark plugs 2 times (the first ones where the wrong ones for it) and the second 6 spark plugs I put in are just like the same ones I pulled out (double electrodes) but not what the repair manual says it should have. Simply because no one in my area (all the auto parts stores) seem to carry what it states in the book. I have also just recently replaced the fuel filter.
The day that I had these repairs done the "Check Engine Soon" light went out and stayed out the entire day. And was running absolutely great.
But within a day the "Check Engine Soon" light came back on and 2 days later it began to hesitate while driving but was not doing it all the time - every day. It would run fine one day then the next it would start hesitating again, and it continues to run like this. However I have began to notice that it gets a little worse if I am driving at night. The repair manual tells me nothing..
Had a bent hood need hood

How long have you had this problem? The car is used for towing with my RV. It has been sitting for two months.
my car starts and drives fine sometimes, sometimes it won't start, when it wont start it cranks fine, just wont turn over. Sometimes it will die when driving. I had the fuel pump replaced about a year ago, and recently had the fuel filter and fuel relay replaced. I also get check engine lights pop on occasionally and when that happens I get a hard shift between gears in my transmission, could this be a bad powertrain control module or possibly another defective fuel pump
What seems to make the problem better or worse? no real reason, sometimes it runs fine sometimes it wont start, sometimes iy dies while driving
How long have you had this problem? 3 months
The car is a 6 cylinder automatic transmission
the whole dashboard is blinking constantly
Drove car, all fine. Parked for 30-45 mins. Started car, in gear, jerking with loss of power. Auto outline warning light with wrench shows. This has happened 3 times, two mechanics, no fix.
I put a new motor in my car but took the whole top of the motor and put it on the one I put in. All the electronics that was on my old engine was switched to the one in it now. The car will start but idles up and down, give it fuel and it sounds like it wants to quit. I was told I need to flash the ECM. If the electrical is all the original hooking up this new motor, why do I need to have it flashed?
When I start the engine it runs fine at first while cool. If you shut if off after running it for 10-15 minutes, the dash lights come on and off, the gauges work and stop working, and when you push the gas pedal it takes it a few seconds to rev up and when it does it only goes to half rev? I blew the engine in the car after I bought it and have recently put another engine in it. Checked over compression, fuel pressure, sensors, wires all connected, grounds were cleaned up before being put on, checked exhaust. I'm exhausted trying to figure out why it will start and run say first start in the am but I haven't driven it anywhere due to if I shut it off when it's warm, I restart it and it's all f*** me please
trans worked in 1st or 2nd up or down shift before over haul
down gear or up gear
I cheked a ignition module and still the same I think a body control module is the problem or ignition ket too can you tell me if they are related
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