Hi from over in the UK.
I have a 68 dart with a 400 big block, running a high (ish) lift cam and a 750 holly.
The car seems to be miss firing a bit every so often, you can start the car and it will be missing. Another time you can start the car and it runs really well.
It's had new spark plugs and plug leads.
The car came from Kansas in late 2013 and I've not changes any of the tuning on the carb/dizzy at all, perhaps it needs changing to run on our 98 Ron fuel?
I took it to a local drag stip here (Santa Pod) and it ran well in 1st, 2nd but in top gear towards 4k rpm it just started missing again and I had a huge shake from the engine and had to back off.
Does it sounds like a timing issue to you guys? Or maybe a poor spark?
Thanks,
Jon
