Misfire issue

[BIIOAB]

My Griff 500 has developed a little problem and I'm looking for some pointers please.

Basically, it starts and idles fine, but as soon as its warmed up a misfire becomes detectable - seems better when the revs go 3000+, but might still be there as it seems slightly down on power, cant tell for sure.
But when slowing down again it becomes very obvious its not running on all 8.
I'm gonna check the obvious plugs, leads etc, but is there anything TVR/Griff peculiar that you recommend I look at before I start ripping things to bits?
Pretty sure its not the stepper as I've had some problems on other TVRs and its not the same symtoms...

[antonyj]

Check the spade terminals in the injector plug caps.
I had a similar misfire, which only appeared when the car had stood and the heat soaked.
One of the terminals had pulled back slightly and was fine when the temp was lower....

[Guillotine]

coils are favourite and are cheap.

andy
tvrmonster

[wilf tuscan s]

I had a similar sounding problem when I owned a Griff, don't know if this might help? It was cured by replacing the relay which controls the ECU and fuel pump - BOSCH 0332014112 30amp. When I took the old relay apart the contact had started to arc. I had to remove the ECU and harness loom and the relay is located in the loom.