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No backfiring at all. The symptoms remind me of a clogged cat but that's been checked at least three times!


....ok....I still have my money on retarded timing under load....possibly one way to test this is dis-co the wire from the knock sensor and drive it. It should ping. And should have much better power on the hills. But don't let it ping excessively as it might hurt a piston.

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01 Taco xtracab V6 auto TRD white
mostly stock
88 Runner/V6/auto/31"/5.29gear