Pickup problems

Old 04-18-06, 04:28 AM
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Join Date: Feb 2002
Location: Kansas
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Pickup problems

I have a 1988 GMC K2500 5.7 engine. When I drive down the road some times, it starts to sputter, if i dont put it in netural it will die, then I have a hard time starting it. When it does start I get bad cloud of black smoke coming out of the exhaust. Could the problem be the IAC sensor or the Throttle body sensor. Thanks for your help.
Old 04-18-06, 04:45 AM
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you should start by checking for codes by jumpering the a and b terminals on the diagnostic connector under the drivers dash and turning the key on and counting the check engine light flashes it will flash each code 3 times starting with 12 and then repeating over again.

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