Ok I got the right one Sierra 18-7704 I took measurement is less than 1.125 and I nstalled instructions say to run vehicle over 40 mph does this apply or do I just rev the engine? Engine is 1999
That was what instructions that came with it said I put new valve in and it was idling at 2000 rpm took out changed pintle distance to match old one same thing cleaned old one reinstalled idle still varying but stays close to 1000 rpm instead of 650 very hard to set timing otherwise runs great