As the 3.8 turns

1. black smoke coming out the tail pipe
2. rough idle at start
3. no throttle response
4. lights dim when ac on heat on radio turned up loud
I changed the carb 3 times already. Still no improvement had it tuned professionally. could it be
1. head problems
2. cam flattened out
3. crappy carb "motorcraft carb"
4. gas tank has a hell of alot of trash
5. fuel deliver problems
I need some help
 
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