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Have a '97 3500 that is running rich in we've done several things including plugs plug wires so on and so forth clean this clean that one of the main things is that it has trouble starting the first time you turn it over cranks real hard then it fires but it will not run it idles rough for a second and then shuts off but then when you turn the key the next second time it bumps right on and runs fine. We have changed the starter and it started better but still has trouble starting.
 

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Scan tool, read the pids when cold. Make sure both IAT and ECT match the ambient temp.

Make sure the MAF value makes sense and isnt way off.

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