91 Chevy 1/2 ton 4x4, 5 speed, computer chip

Discussion in 'Chevy C/K Truck Forum' started by rbaker59, Feb 10, 2013.

  1. rbaker59

    rbaker59 New Member

    I just bought a 91 Chevrolet, 5 speed, 4 x 4. The original computer was not with it. The previous owner had put a computer in it from a van. It kept gas fouling the plugs. After changing all the sensors and distributor, it was still gas fouling the plugs. I put a hyper tech performance chip in and it seems to be running better, not fouling the plugs, shift light stays on and cuts out when shifted into overdrive. Gears 1 thru 4 run fine. Any suggestions about the overdrive?
     

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