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FritzA · 02-26-2011, 02:24 PM

Another thing to check......how old is the fuel filter? Check the hoses for kinks. The low pressure of these means nything is a restriction.

How old is the coil? You can pick up a nice MSD coil which helps these engines for about $30.

Skip White has low cost distributors for TBI engines, look for his ebay store. Mixed reviews on them...some say they are good and some are not but the pric is low. Used ones are cheap at the junkyards too. Like Chevy Tech said, get a 91 - 95 unit.

At 171k miles I would also expect the TBI unit itself to be getting worn. They were not built for longevity. I am referring to the bottom half with the throttle plates. The shaft that the plate is on wears and gets sloppy. A good rebuild on this is between $150 and $200, good bushings on the shaft and all the passages will be cleaned out. You can also pick up used ones with less mileage if you look around.

Good luck and please post what solved the issue.

02-26-2011, 02:24 PM	#8
FritzA Registered User Join Date: Jul 2009 Location: Denver Burbs, CO Posts: 115	Re: 87 Chevy 350 TBI low Idle issue Another thing to check......how old is the fuel filter? Check the hoses for kinks. The low pressure of these means nything is a restriction. How old is the coil? You can pick up a nice MSD coil which helps these engines for about $30. Skip White has low cost distributors for TBI engines, look for his ebay store. Mixed reviews on them...some say they are good and some are not but the pric is low. Used ones are cheap at the junkyards too. Like Chevy Tech said, get a 91 - 95 unit. At 171k miles I would also expect the TBI unit itself to be getting worn. They were not built for longevity. I am referring to the bottom half with the throttle plates. The shaft that the plate is on wears and gets sloppy. A good rebuild on this is between $150 and $200, good bushings on the shaft and all the passages will be cleaned out. You can also pick up used ones with less mileage if you look around. Good luck and please post what solved the issue.