Checked air filter, Replaced cam and crank sensor, Plugs, Here is what is happening the ign timing is dropping out meaning at high idle it will be about 27 then will drop to 0 and stumble backfire etc. or at idle will fluctuate from 5 to -4 then stumble and die no codes,
I know these have a timing chain with tensioner is this where I should be looking have been talking to Nissan Cat Tcm Techs and they are drawing blanks on what is going on someone has to have seen this before Thanks