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Q: i have 1988 suburban it idles fine but when you give it gas it dies. on 1990 GMC Suburban 1500

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IT will sputter it wont run long even in idle.
(3) Answers
Possibly a bad distributor cap and rotor. If it gets worse when it is damp out I would be almost 100% sure thats your problem. Your looking at about $20. You may have a bad fuel pump. Check fuel pressure. When you hit the gas the car demands more fuel so the fuel pressure may not be there to meet the demand.