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1990 GMC 1500 Pickup Question: addition info

 

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lagu, 5.7L V8, Seattle, WA, March 01, 2011, 11:11
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I failed to mention i recieved a code 42 sorry. also it's a automatic. stalls intermittent, starts back up fine, changed dist cap rotor and timing mod check plug wires, oil, coolant. 137,000 great miles till now. code gave 3 different possabilities but am not an expert. any help?thanks in advance

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