It will run fine for a min then get where it wont got, it will not pull at all.
Similar problem after 20min cool down due to bad o2 sensor in exhaust manifold, and under certain driving conditions this problem returned. I noticed the battery was sliding into computer wiring harness disrupting sensor input/output signals. I cured problem by placing a 1" spacer on rear battery clamp, pushing battery forward. Problem forever cured.
Change the spark plugs and wires
SOURCE: every time i put a new muffler on my 1997 jeep
What a funny set of events.Of course the tail pipe is clear(you would have checked that)The only other thing it might be is the cat/converter is blocked.New muffler is allowing a heap of air through and it suddenly clears and the bang.They do block up so it may be worth getting it checked.Hope this helps
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found my problem related to front oxygen sensor and battery sliding into computer wiring harness disrupting sensor input/output signals. placed 1" spacer on rear battery clamp pushing battery forward. this cured my problem.
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