Hi, my 1988 Sierra 2.8 has i think a misfire, it tickovers slightly uneven, and if you raise the revs a little you can hear a misfire.. I did pull the leads which seemed ok so changed,
Coil
Dizzy cap + rotor arm
Plugs
Leads
Reset tappets
Still runs exactly same but when driving you can feel the poor running through the car, if that makes sense. it just doesnt go like it should.
Just not sure what to check next, and it's my daily driver so need it sorting.. any ideas very welcome


Steve