This weekend i put in a NAPA reman 351 with comp cams basic replacement cam in my 92 f-150. On sunday I got it in and drove it around 40 miles and evey thing seemed good, maybe alittle doggy but over all ran good. Then I went back home over the mountians about 250 miles and on the hwy and it did not have any power at all. It ran worse than my old I-6 did and on top of it it only got about 9 mpg allot worse than the 16 mpg i got with the old 200k mile engine. I thought it might be timing and was planning on checking it the next day after work. This morning when going to work it was very cold out and it started fine and ran the same. At noon it started and then died and would not start again. it sounded like it was out of time really bad, would try to start but would not grab hold. Later to day i went back to try and get it going. IT started but I had to keep it going for a min or two then it ran like it has been. I checked the timing and it was at 10 BTC with spout diconnected. When gased it advanced to some where around 30 degrees. One thing that seemed strange is when you let off the throtle it took quite a while for it to return to 10 degrees. other than that i dont know any thing else. All I can say it it has no power, firing order is correct and timming is set at 10 degrees. Any other ideas. This has been a pain, after busting my *** this weekend to get the truck done and all the money and it dose not run good
Really appricate any feed back
Thanks

 

well i know this doesnt help but the 351 is a gas guzzler dont expect big mpg out of it and is it injected or carbuerated?