my 06 f350 lariat 4x4 crew cab with big wheel kit egr delete bullet proof diesel engine oil cooler and bullydog PMT programmer 210k miles is having intermittent problems on a good day it starts up fast and runs like a champ the rest of the time i get a no start condition the motor turns over strong but the tach does not read any rpms sometimes if i try it a few times it will register rpms and crank other times if i hit it with a quick shot of ether it will fire up other times that wont even do it when it does run sometimes sitting at a red light it will surge as if someone had hit the gas other times it will surge then die i also notice if i press the break petal more than half way i loose the rpm reading on the programmer the only pattern is that it will not crank until the factory tach shows 100 or so RPM and the only code i get is for crankshaft position sensor circuit A i have replaced the crankshaft sensor the camshaft sensor the ICP and pigtail i have tested the output voltage on the ficm tried to visually look for wiring harness damage and tried running with and without the programmer and none of it has helped i am wondering if it could be in the tach wire or if it could be in the powertrain control module any help would be appreciated i cant afford a mechanic except as a last resort