2007 dodge ram 1500 4.7 flex fuel engine

It could be a cam or crank sensor out of calibration or not picking up TDC signal. I had a Jeep with a 4.7 and had a similar symptom, replaced both cam and crank sensors and bingo no more problems. This problem will not appear on a code check, it will show on a waveform pattern if it is acting up at the same time as the waveforms are being scanned.

I'd suspect the battery before the starter. I assume as part of the starter/alternator test they load tested the battery. If not, they should have. Also, they need to put your cold cranking amps (CCA) of your battery into the tester before they begin the tests. I'd load test the battery again and check the battery cable connections at both ends. The starter could be getting tired but it would have drawn excessive power while cranking during the tests. BTW, I've used that type of tester before. For a quick snapshot of what's going on they're pretty good. But if you have an intermittent problem, not so much. For example if you have the problem when the engine is cold it wouldn't present itself for the test because you drove to O'Reilly's for the test and the engine was warm. Jim

The problem has solved itself. It must have been a short from the positive cable to ground for when I was testing the positive and negative cables for resistance I must have nudged the positive cable away from where it was grounding when getting my hands and multimeter probe down to the positive cable lug on the starter. Now it starts up as before. I just need to find where the fault is and tape it. Thank you all for your ideas

You're welcome, glad to help! Thanks for letting us know! If you find the positive battery cable itself is worn you might want to replace it. Jim