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i got my j-pipe rewelded but i still get low vac at idle... the MBC is set at 17.5...vac at idle is near 10 psi or lower sometimes but when i rev it the vac will fall down to 17.5 then back up to 10 weird..i checked all couplers and reducers retightened everything....still low vac at idle anyone know whats wrong??? what to check???
oh yea and i keep hearing this hissing sound coming from near the injectors
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