1997 Dodge Ram Van 2500 Questions

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Motor running fine no power supply to blower motor in rear need fuse location
My 1997 Dodge Van B2500 will not pass smog due to po300 misfire code.
I have replaced cap, rotor, spark plugs, pick up, fuel pump, spark plug wires, and injectors. Still misfires.
Also replaced timing chain and had a valve job done.
I don't hear any noises. Also today replaced the flex plate.
Has troubles starting after sitting over night when it does start you have to give it gas until it warms up and runs fine after that and start up after
Before this happened it back fire loss power cut off while driving won't crank over an stay on
Then I Noticed That The Ignition Switch If I Turned The Key Off,Pull It Out, Put It Back In Start It The Check Engine Light Was Out And The Trans. Shifted Fine. The AC Still Blows Hot Air. This Is My Sisters Car, And She Told Me That She Was Listening To A CD And When She Ejected It The CD Was Hot.. I Took It To Parts Store They Ran The Codes. And Told Me He Wouldn't Clear The Codes. And To Take It To A Trans Shop... I'm Thinking It's The Computer On It..
Hard To Explain... The Engine Is Not In A Pull.. And It's Not Slowing The Van Down. It's Like When Your Using The Cruise Control, And When It Kicks Out At The Speed It's Set At. But
It Goes Out,Then In,Then Out. I Have Been Told It Was A Random Misfire On No. 1 / 3 Cylinders. And Random Misfire Depends On Who Run The Computer On It.. And About A Week Ago While Driving Home At 45 mph The Trans. Went To Growling/Squealing Then It Quit, Next Day It Did The Same Thing, But It Stopped Pulling.. I Still Think It's Electrical.. Anyone Got Any Ideas?? Or Needs A Parts Van?? Lots Of New Parts..
If i keep my van under 45 mph my van doesnt shake at all.... if I get up to 45 mph or greater my van shakes and doesnt stop shaking. until I stop or park

i need to know if this car has a carburetor?
give gas its bogs down like its starving for gas unhook fuel line from fuel has pressure
All parts have been replaced, even the ECM a couple years ago. O2 sensor has been replaced 3 x's in 2 yrs. Ignition coil 2 x, crank sensor, plugs, complete fuel tank and filter change, some other type of sensors and still the problem continues. Just paid shop yesterday, problem was supposed to be fixed with another ignition coil and plugs, on the way home and work today, stalls while driving. Takes a few times to get it going again. Had Autozone last week say it was missing on 1, 3 and 5 and ignition coil issue. Just do not understand this. It is our only vehicle and we need it for work.
i change the water pump, thermostat checks for leaks,after changeing thermostat i can drive it about 30 minute before it all the way in red zone if i stop and just let it run it will go to normal
when opening the door in the real of the door there is a lock assembly that has a broken spring that operates the lock to keep the door closed and locked
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