Mikesv1957
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2002 LB7 completely stock. has always run very strong. original vacuum pump ( California emissions system ) started knocking loudly so i had it replaced at a local shop. the truck now runs like it always has in the morning until it comes up to operating temp. and then looses power in 1st through 2nd gear shift with HEAVY BLACK SMOKE. ( this truck has never had black smoke ) running third through fifth gear is strong as usual. can the new vacuum pump cause other sensors in the emission system to fail ??? little help here please