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Re: Missing badly after checking fuel pressure.
Problem Solved. Turns out that during the process of checking the fuel pressure, and replacing a dirty fuel filter (was very difficult to blow thru) due to recurring P0171, P0172 & P0106 CEL's.....two of the original ignition coils went out, giving a P0300. I had a friend with a scan tool diagnose it and replaced the two bad coils related to the missing cylinders on his scan tool.
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98 Regal GS - 3" DP & Cat back, 9" K&N CIA in FW, Plog, 3.5", 180* Canned tune. 14.65 at 96.9mph, w/2.37 60ft. on G-Timer @ 4500 elev. @ 51*.
87 Buick Regal Limited - 12.04 @ 115 - Purchased new and sold it after 23 years and 115,000 miles.
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