98 Malibu #1/#4 misfire under heavy load/high rpm. All secondary ignition good. Propane enrichment does not help.

#1 125psi #2 175psi #3 175psi #4 125psi

#1/#4 low compared to #2/#3 but in "acceptable" range of 70% per spec... I have not tested (but will) ... Login to read more.