RE Running problem 86 Suburban Late reply

I had an 87 Suburban with 350- TBI. It did similar things- ran great idle, bogged down under a load. I discovered a small worn place in the insulation of the wires going into the carb throat for the ingectors. When under a load the engine rotated more (also worn engine supports) and the air intake horn rotated and shorted out the wire just enough to stop the injectors. A patch on the wire fixed it.

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Loch Stockenbarrel
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