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My GT40 has developed a slight rolling idle and also seems to run a little rough under load at low rpm. Watching the rpm gauge on my Perfect pass, the change in rpm is minimal, 30-40rpm but you do feel the engine hesitate and judder slightly. I've already replaced the relay to the ECM and the idle air control valve so my next plan is to replace the hose inside the FCC just in case it has developed a crack. Question, as I replaced the FCC filter not too long ago so it doesn't need replaced, is it an absolute no no to open the filter can to replace the hose and not change the o-rings/gaskets.
If it comes to it, I'll just purchase a new filter but they are a little tricky to come by in the UK and are expensive.....
If it comes to it, I'll just purchase a new filter but they are a little tricky to come by in the UK and are expensive.....