k4.6 ho engine question . cant seem to find low end power.im getting killed on that part of track .and when i think ive adjusted in right direction.the next heat proves me wrong again.alot of smoke and engine temp is 230.is this engine known for problems.truck is hooked up just no power .i can only seat myself 7th for main.everyone asks why i cant get it tuned right.cant tell if its lean on bottom or rich.at end of 5min heat i have about 1/2 tank fuel left.please help tired of overdriving truck to try to keep in power band of current set up.