Fuel backups into the vapor purge line and causes the charcoal canister to read no vacuum. This should reset itself after the fuel level drops and a few engine cycles pass.
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88 NMRA Pure Street coupe
95 GT-heads, cam, exhaust, intake, road-race suspension
97 Taurus SHO-K&N, ported meter
95 Escort GT-Pacesetter header & exhaust, Weapon R intake tube
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