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Q: addition info on 1990 GMC 1500 Pickup

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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
(1) Answer
I would recommend a complete distributor overhaul or replacement with a quality rebuilt unit to correct the code 42 and stalling condition on your 1990 GMC 1500 Pickup. This issue has been reported in ReplairPal Problem Reports - http://repairpal.com/internal-faults-in-distributor-can-cause-engine-problems-439