stumble
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stumble
Earlier this year I had my '87 150 w/ 4.9 EFI in the shop for a no run/bad run problem. They couldn't figure out what I later found- a bad dist. module. Now that it runs again, I have a problem with it "stumbling" after acceleration - usually when I'm getting it up to 35 or 45 and levelling off I notice it most.... Sometimes slight, and other times more violent.... The shop apparently had the truck backfire and ruptured one or both cats. I have installed a new O2 sensor and new temp sensor (thermostat housing)...and reset the timing to factory but it pings more than I like - poor gas, probably...Any ideas? THANKS
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