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2002 Dodge Ram Van 1500 Questions

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Wld an EMC(engine mgmt control)
From a 2000 dodge ram 3500 v8 5.2

Work on my 2002 dodge ram van 1500
V8 5.2
had an issue with car last year and found out it was the EMC, replaced last year w/ a after market unit which worked all year.
I put 30k last year on it.

After bring it to mechanic which replaced all the normal stuff( dist. cap - both positioning sensors )
I still had no spark so the EMC was last thing to buy.

I bought another one from the same vendor and installed but took time to get car strted.

then the car just wldnt start
i called them back and sent me another one. I installed new one and same issue
It started ladt wk nd getting worse.
When hiiting bumps or unpaved roads

Driver side tire making clanking sound lke metal on metel.

Removef tire to check for play on upper ball joint but dont see much

Coil replaced pickup coil replaced engine spins but no fire
i checked fuse for fuel pump and it good. sprayed some carb cleaner still nothing.

any suggestions
Symptoms of a bad wheel bearing.

Driver side tire starting to shudder .
I don't know if it's a ball joint something else.

Any 1 here has dealt w/ this b4
I've been reading other post w/ similar problems Nd ever1 points to PCM box.

has any1 bought a refurbished pcm Nd wat luck have they?
How to solve motor revving up and down too much when AC compressor turns on. 3.9 L. RPMs are really running High
I bought a 2002 Dodge Ram 1500 conversion van recently. It came with only one key, and on the key ring is a little white square that says Chrysler on it. On the dashboard, is a white dot that you are supposed to hold the square up to and it disables the anti-theft device which otherwise won't let you start the vehicle. There is no clicker to lock/unlock the doors or disable the alarm, just a key and that square white thing. My manual seems to imply that maybe there was a clicker, and it says nothing about this white square thing. I'm afraid of what will happen if I lose it and want to learn how to get another one and also if the vehicle once came with a clicker to unlock the doors, etc. Can anyone with experience with this vehicle speak to this and provide me with some guidance? Thanks in advance!
Towed to Mechanic, who now is talking about the computer in the vehicle.
I had the radiator open adding coolant.
tried a new master control but no change. the lights on the switches light up with the ignition. on rare occasions the windows will work but very rare. seems as if something is not sending the signal to run. can you help please what do i ck next. Fuse seem fine.
My tyranny will not go into park so I can get key out will start in neutral and change to other gears except park pulled linkage off shift into park to get key out put linkage back on still won't go into park ? Any advice will be great appreciated
Is there a circuit that could be shorting, causing the PCMs to fail that commonly occurs on these models? Several times people have mentioned the O2 sensor circuit; is that a good place to look?
also has had two tune ups ( second one was done without asking ) new o2 sensor. brand new $300 PCM now the damn mechanics cannot get it to start!
then where the mileage shows I am getting No Bus where the numbers are. If I let it cool down it will start until I am driving for awhile then it shuts down again. What does no bus mean?
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