Horribel Fj60 back fire

Jun 25, 2003
Rixeyville, VA
Just got out fj60 back from the shop. they had to do alot of work to get it to pass inspection, which included almost an entire ne exhuast system. when i turn the truck off it doesnt totally cut off. kinda rumbles for a second. i assume this is in the fuel cutoff selnoid. although the 60 has done this forever. hasnt been a big issue. but now it backfires like a 12 gauge shotgun whenever i cut it off..its so embarasing any ideas of what is wrong. also after it has warmed up whenever i push the clutch in the revs super high. like to 2000-2500 rpm's the shop didnt know how to fix it i guess. well thanks. i need to solution to both the backfireing and reving problems. thanks again

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