I just replaced timing chain and rod bearing got it all back together and it starts fine and idles good cold but when it gets warm the idle falls to about 400 to 500 rpm's from 800. took it for a drive and it has no power. did a power balance test pulling spark plug wires and the number 2 had no effect on the rpm's it was getting spark though and has brand new plugs and wires. I have looked at many posts with similar issues but no one has every come back and said what they did to fix their problem. also engine has a pretty good ping when cruising with no load on the engine. not at idle though just at cruising speed.