eljefino: If the 4.9L is a gutless wonder (mine was too) might want to see if the cat is plugged. Mine was plugged solid and it would start and run fine, but barely get out of its own way under load. Gutted the cat and it was a massive wake-up. It wasn't going to win any races, but had no problem holding 110 with a several thousand pound U-haul trailer behind it with my buddy's 5.0L Mustang on it.