I did a cam swap a couple of weeks ago, at the same time I seafoamed the motor. I went to the track and had slowed down .3 but mph went up 2mph. My 60' were worse too, so I think I had some traction probs. Anyway I pulled the plugs and they were fouled (probably the seafoam) Changed them with regular tr55's and it seemed a lot stronger. Took to the dybo last weekend, after the second pull it developed a miss. I pulled the pushrods, and a few were not clean, so I cleaned all of them. It idled smoother, and seemed fixed. Today on the way home from work, however, it came back with avengence. Now it has week spots in the power curve, it misses, and pops and pings. WTF? Is it a lifter not pumping up again? A tune problem? Or did something bad happen?
Is it time for a 6.0 or 408? I hope not, I'm broke right now

 

Are all of your plug wires tight? Is it throwing any codes?

 

Hence the beauty of plastic...

 

Yea, they are all tight, and no codes

 

I wish, I lost that ability in my divorce Besides, I'd hate to swap in a 408 long block, and it be a top engine prob. With the lock I have I'd end up burning a piston or something.

 

As bad as this is going to sound.. you might want to just take it to someone. I hate taking my truck places to get stuff done, but sometimes, its the best thing... I'm about to have to bring the truck into the tranny shop... I know as much as the next guy about whats wrong, I just dont have a lift or the time to mess with it, too much working.. but you might want to see if you could just bring it somewhere...

Idk which one or where it would be... but seems to me like a seal or vavle is missing or blown somewhere. If something is that noticeable in driveablilty, I cant beleive there arent any codes thrown yet.

 

I'm scared to take it somewhere. They may tell me a valve is screwed or something that would cause me to spend a a$$load of $$ like stage 3 5.3 heads or something . I agree, I may have to take it to the shop. Hopefully Thunder can tell me whats up.

 

Think of it this way, if you take it somewhere that knows what they are doing (for sure) then you can fix the part yourself and basically spend like 80 bucks on diagnosis

 

Whats the possibility of it being an O2 sensor. It doesn't do it when its cold. Don't the trucks run in closed loop till they get to operating temp?

 

O2 will set off a SES