Motorhome would not run very well we thought it was coil packs going o... read more Motorhome would not run very well we thought it was coil packs going out V10 motor, We took it to Jack, he discovered the catalyst converter was clogged choking the motor down. Then after he replaced the converter, he was able to tell it was the PCM. Jack knew that if he replaced this expensive part without finding out what caused it to go bad that it could happen again. Even though he could make the money and replace the part, he told us it had to be diagnosed by a Ford Dealer. Very Honest Dealer!!!!!