from all the info I have received I now think it was bad gas from arco.....I filled up the tank with shell and it seems to be better....I am still testing.
ARCO runs the "hottest" gas mixture allowed and that's why it is the least expensive, the more ethanol you add the cheaper the gas.
We are near the refinery and had issues with Jeep fuel pumps one year and ran it back to "hot" gas. When an ARCO employee came in with a bad fuel pump from another dealer we told him our suspicion without knowing he was with ARCO.
He asked to borrow the phone, dialed a number and said, "Charlie, are you guys running hot loads again?" Swearing insued and the guy explained he only ran ARCO as a loyal employee. He had four fuel pumps from the other dealer before he came to us thinking it was the dealer that had a problem.
Since then I only would run ARCO in an emergency. Like I was pushing my vehicle and couldn't find any other gas or get a cell signal to call AAA.