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Hard to start cold

(1998 GMC 1500 Pickup)
in Beverly Hills, CA on December 30, 2010
4.3 v6 hard to start when cold starts fine hot has missfire around 2300 &5000 rpm
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Popular Answer
on December 30, 2010
Check the fuel pressure of your 1998 GMC 1500 Pickup. It should be 60-66psi with the pump running and the engine off.
on December 30, 2010
From previous experience there is a TSB (Technical Service Bullitin) that maybe the problem.It concerns the crankshaft sensor at times can cause ECM to set timing to 50 degrees advance causing starting problems.
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