HELP - can't go over 45

[modelageek]

Put the coil in it today, took it for a drive and it did the no go over 45 again. Started leaning towards a possible trans. problem. But, when I pulled over and shut the truck off for a few seconds, then started it back up, it drove fine. I am going to swap out my autolite double plats for some motorcrafts to rule them out. Don't know where to go next. Fuel pressure? Fuel pump? Swap out the computer? I'm just going to have to break down and take it in I guess.

I don't want to read the whole thread but if you have not done a fuel pressure test yet that is what you should do before throwing in the towel...they take 15 minutes..you can borrow the tester or buy a cheap one at harbor frieght for $17...you should change the filter first

 

[powerranger262]

CEL finally came on today after it really started getting bad yesterday. Cylinder 3 misfire. Pulled the plug, and the ceramic was cracked. New plug and it runs like new. I must have had a cracked one before I changed them, and the new plugs I put in must have had a hairline crack in it also that I didn't see.