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cal30_sniper · 07-17-2012, 06:51 PM

Ignition Module and Coil are a quite common problem for TBI injected vehicles. I'd start there, replace them with AC Delco replacements, not the aftermarket "performance" offerings from Accel, MSD, etc. They are notorious for blowing out right after being put in.

If that doesn't fix it, I'd look into replacing the MAP sensor and TPS. If you have a digital voltmeter, check that the MAP sensor and TPS are both functioning properly. Also, have you checked to see if it's throwing any codes yet?

-cal30sniper

07-17-2012, 06:51 PM	#4
cal30_sniper Registered User Join Date: Jan 2011 Location: Coastal NC Posts: 276	Re: stumble on 87 suburban, Ignition Module and Coil are a quite common problem for TBI injected vehicles. I'd start there, replace them with AC Delco replacements, not the aftermarket "performance" offerings from Accel, MSD, etc. They are notorious for blowing out right after being put in. If that doesn't fix it, I'd look into replacing the MAP sensor and TPS. If you have a digital voltmeter, check that the MAP sensor and TPS are both functioning properly. Also, have you checked to see if it's throwing any codes yet? -cal30sniper __________________ 86 Chevrolet K20/30 Suburban - 8.1/NV4500/NP205/Dana 60/14 bolt FF, build in progress 73 Formula - 400/Doug Nash 4+1, resto on hold 86 Chevrolet K30 3+3 - 350/TH400/NP241, Air Force/Forest Service Rescue Truck, for sale 01 Ram 2500 - 5.9L Magnum, daily driver 91 BMW 325i - Chumpcar series racecar Last edited by cal30_sniper; 07-17-2012 at 06:56 PM.