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Thanks for everyone's input on my problem. I decided to change out both the leads and the plugs and it appears to have fixed the problem.

Thanks robnicko, I'll check them out as a first step.

Hi gummycarbs, it just seems to stumble a bit and definitely seems to be RPM dependent. As soon as I kick it back from overdrive and the RPMs increase, the stumble goes away.

Thanks for the reply, the misfire happens on both LPG and Petrol. Maybe a little worse on LPG. It has a vapour type LPG conversion. I haven’t checked what plugs are currently in it but I will do that when I get a spare minute. Do you happen to know what the resistance specs are for the leads...

Hi all, I have a '97 80 series with a 1FZ-FE engine. It has been modified to run duel fuel. (LPG-Petrol) It starts and runs fine except for a misfire that appears at around 2000 to 2400 RPM. It usually happens when its just cruising and not really under much load. If I accelerate hard, it revs...