ok so i recently just put a new muffler on my truck. its a '94 f150 v8 5.8l. about two days after i finished putting the muffler in myself my rpms would shoot up 2500 then drop down to 1000 then shoot right back up to 2500. it would go up and down a few times. i now the guage isnt broke becuase i can feel the truck lose power. this happened twice. could the new muffler have anything to do with it or is it from the cold (its snowing here). any comments or ideas?

 

seriously? were you on a dry road or an icy road

 

what muffler did you use? I don't know if this would cause this but if it's directional (ex. flowmaster) then you want to make sure you installed it the right way. Are you driving when this happened or did it do this just sitting in park?

 

^ That would not cause this. If it is doing it while driving, then it sounds like your tranny is slipping.

 

Yea figured it wouldn't just tryin to name out the simplest of problems

 

glasspacked cherry bomb muffler. its a icy road and ya it happened when i was driving. it happened agian today

 

A muffler will not affect traction or performance..

Sounds like you A, are spinning out and do not realize it, or B, your transmission or Torque Converter are about to fail you.

 

man...if its the tranny im not looking forward to having to get a new one...

 

Does it do it under a heavy load? When you step on it?

 

it happens when i drive normal. sometime it happens when i dont even hit the gas pedal

 

How many miles are on it?

 

around 62,000

 

Must have been a rough 62,000 miles to have the tranny letting go so soon. Do you use the truck for towing/hauling?

 

ill throw stuff in the bed but nothing to big or ridiculously heavy

 

x2.