Is the ticking sound an exhaust leak? I had an exhaust leak on my 92GT( flows with off-road h-pipe and 6# blower)and when I let off the gas or decelerated, every now and then it would have a huge backfire. I mean it sounded like a grenade went off under the car. I found the flange on the pipe to the hedder had a small gap and that caused the backfiring. I sealed it up and it went away.
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