For a year my 1988 GMC Vandura with a 5.7 TBI would crank but not start. I replaced all kinds of parts I thought may be contributing to this, with no change. Finally out of irritation I climbed under my van removed the main ground cable that comes off the battery's negative terminal and bolts to the bottom front of the engine block. I took my Dremel & wire brush to the connector and bolted it back on... after one year of not starting, a 30 second "clean up" and my van started up on the first crank.... moral of the story, start with the basics!

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