Remember the 850R Auto misfire just wouldn't go away??

I tried everything new plugs new cat had it read...etc etc...
Eventually I fixed it..and it could be one of two things
I bought a set of El-cheapo Bosch HT leads specifically for the 850...oh yes, that would be a Zastava 850!..wellthere were 5 of them and they fitted... any way I fitted those
I also bought a genuine Volvo Fuel filter ..yes the bracket was "WELDED" on screw snapped Hadn't been off in a lifetime
Fitted that, now I didn't go for a test between doing the 2 so I don't exactly know which one worked but it revs off the clock now in every gear goes like the clappers agin..HUSSAH!

Good news, I'd place bets on the new HT Leads as they cured a very slight misfire for me when recently changed :)

What he said.

New ignition stuff cured my misfire on boost

When I get a minute I'll put the old HT's back in and lets see if the misfire returns....??

I wouldn't bother, if it ain't broke....
main thing is it lives on to fight another day.