2002 Ford F-150 Questions

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can i put IRIDIUM FUSION SPARK PLUG in my 2002 ford -150 4.2
driving along started violent jerking to the left really quick then normal. about 1 mile later came to a hard stop, turned into a vacant lot and could tell the left front brakes had locked and wouldnt release. Then ABS light came on,
After putting the truck in drive when hitting the accelerator you feel vibration in the rear of the truck until you get the truck up to speed and it does it every timw you have to stop and go. We are also having problems with our 4 wheel drive when engaging it you cant go faster than 10 mph and when disengaging the 4 wheel drive the truck makes an awful noise coming for the front center of the truck and the truck will not allow you to go faster until it kicks its self out then the truck drives normal other than the rear vibration.
Can hear air blowing when truck hits 50 mph. Noise is coming from the back seat. ( extended cab).
The last owner has by passed something in the heater system but I can't figure it out without a picture of what the system is supposed to look like.
Heater not working.
That's all I touched was the radio
More frequent when AC is on, not as bad at higher speed, idles ok
1st time it was running fine check the rest of fuses related to the air cond and they're ok
Can i tow 4 wheels down with this vehicle? It is a manual transmission. So if it is in nuetral will it be a problem?
a/c does not blow out center vents
I really cant aford to replace cat what else could it be to pass smog test and reset check eng. Light
I was wanting to know if it could be something besides cay
bought a motor. It had to be removed from wrecked F150 truck.
Does this at stop lights or at idle. After sitting for minutes or hours, It will restart and run fine. 5.4L Triton engine. Shop reports no engine codes.
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