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fuel pressure gauge won't tell you if a poppet has gone bad. What do the plugs look like from those two cylinders? That may be your best indication. Also as stated an internal vac leak will cause it to misfire or run bad.
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--==RPM Resto & Custom==--
1989 IROC-Z Media Coverage:
Chevy High Performance - Readers Rides 4/03
GM High Tech Performance - Tech Article 3/06
Chevy Rumble - Tech & Feature Articles November 2006
Auto Restorer Magazine - Feature Article 5/11
SkinAndSteel.com
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