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definately if there is a leak in your exhaust system that could cause a false lean reading by the o2 sensor and the computer would compensate for it. but also check for any intake/thottle/vacuum leaks this could cause that too. when I had my 2,4 back in the days and I put the 2,3ho intake manifold, there was a small leak at first and it was doing the same things as you said...
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