Hi all
I have a 98 EL falcon duel fuel, it runs great on gas but on petrol it's missing all over the place, it's not missing on any one cylinder in particular as far as I can tell it feels like a fuel pressure problem, tho I'm not sure of that because iv put in a new fuel pump, fuel filter, reconditioned injectors. It has a new head gasket (5000ks ago) and a EL XR6 head,cam,etc (all reconditioned)
Is there something I have missed (I'm no mechanic so its very possible)
Josh

Welcome mate. I'm going to guess you've got 2 problems. First is a buggered inlet manifold gasket giving you a rough idle. The second I'm not sure about, but maybe o2 sensor / some other fuel delivery issue? Other than that, I could only suggest the MAP sensor might be a bit buggered or the TPS is done (eg, the TPS is not reading correctly at its limits)

Have you checked your spark plugs and leads?

my old mans did this, found he back fired on gas and blew the hose of the MAP sensor on the firewall behind the manifold put it back on and all good