Rocker Arm?
Rocker Arm?
also 2 menchen its running very lumper like it has an air leak but it dnt ha
best thing ye can do is take the rocker cover off and have a look see what state the head is in. If it's like a constant miss it could be worn rocker arms? like they've worn a flat spot on them.
Ye could also change the oil or take the sump off to rule out bearing failure. check to see if there's and metal filings in there?
when's the last time it was serviced?