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I would start @ the Fuel Filter Then the sock in the tank-IF the fuel pressure is OK then look @ the COIL etc.IF the Timing chain jumped a tooth-Serious power loss.IF all 8 Cylinder have Good Compression OR EQUAL Compression-IT is a spark or Fuel Problem. IF it has a Distributor EVEN a bad rotor will cause a serious power loss.

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Q: What would cause a serious decrease in power on a 1989 Chevy Suburban 350 half ton 700r4 with 194 thousand miles?
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