PO300 and PO161 and bad MPG 1996 K1500 Chevy

Discussion in 'Chevy Suburban Forum (GMC Yukon XL)' started by Dantheman96, May 5, 2011.

  1. Dantheman96

    Dantheman96 Member

    My 96 k1500 5.7 is throwing the famous PO300 and PO161 code. The only thing is the truck runs smooth as glass with no power loss. The only noticeable loss is the 2 mpg drop. I was getting around 15mpg, now it's only around 12. I replaced the intake gaskets a couple of months ago, so I know that's not the problem. It has a new distributor, wires and plugs. Also the SES light goes off and on occasionally. I've heard of people having these codes with driveability problems (rough idle, hesitation), but that's not the case here. Any suggestions? Thanks!

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