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My 1987 Ranger has had this intermittent problem for about a month now. Fuel pressure & ignition system is normal. It was coughing in the mornings when cold, but I corrected this by changing the Air Bypass Valve. I also found the EGR Valve not opening, so I replaced it along the the EGR Solenoid, still no help! I also checked all vacuum lines, no leaks noted! I'm wondering if I have some clogged injectors? But if so, why is my problem intermittent? Wouldn't it be running rough at all times if the injectors were clogged? I'm getting tired of throwing parts at it, I could use some good advice! Thanks, Elwood
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