Hi, I'm new to this forum, wonder if anyone out there can help.

I have a 1995 Mercedes SL500 Type R129 in which has developed a miss fire when hot. Initially I checked the obvious and found both of the caps and rotor arms had been tracking, fitted both caps and arms (Beru), miss fire still there, then found one of the caps was faulty, replaced with new one (Beru), slightly better, checked leads and a couple had high resistance suppressors, thinking that this may have induced high KV's and hence tracking in the caps, replaced the leads, 1st set had 1 open circuit suppressor so returned leads to supplier and bought Bosch leads, dramatic
improvement, no miss fire under load but when hot occasional miss fire at idle. Using the Launch X431 scan tool, no fault codes, but cannot get any live data (management system Bosch LH1 doesn't give any live data). I am now beginning to go bald due to much pulling of hair, any ideas please.

regards Viv Beel