Hi, I decided to replace my distributor cap and leads (I did purchase a new rotor arm but it was a cheap and nasty version so I decided that the old one was way better and left it in place). The leads are Rists and the cap is original Jaguar part (both from SNG). All was great on my first couple of drives and I’m convinced that there was a definable improvement. But, today I went for a drive and the engine was lumpy and the tick over was not good. So I set about trying to find the problem and after checking the timing with a strobe light I couldn’t even see the 8 degree mark at all! I didn’t have enough adjustment on the normal adjustment bolt, so I had to slacken off the collar bolt (excuse my terminology) and rotate the distributor until the timing mark was exactly 8 degrees. I think that the engine is running better than ever - except a very small flat spot which happens when the accelerator is first depressed. After that there is a huge amount of power. What do I do to get rid of the flat spot and maintain the power thereafter?
I also checked the mixture using colour tune which is in spec.
1974 series 2 UK spec