Engine Miss

[smudvapor]

When I start the truck it misses real bad like it is not getting spark to all of the cylinders. I can smell the unburnt fuel while it is running. After I drive it a mile or so the miss goes away and runs great. The miss comes back as soon as I turn it off and restart it. Anybody have a clue what this is?

 

[IMenriched]

When I start the truck it misses real bad like it is not getting spark to all of the cylinders. I can smell the unburnt fuel while it is running. After I drive it a mile or so the miss goes away and runs great. The miss comes back as soon as I turn it off and restart it. Anybody have a clue what this is?

Can be several things ...best to weed down the possibilities by getting the codes 1st.

http://www.therangerstation.com/tech_library/OBD_I.html

 

[smudvapor]

No codes come up. I checked wiring, plugs, ignition, sometimes when I am sitting at a light it will start to idle rough and almost stall out, then it rights itself and starts running good again. I checked the TPS and it is good (voltmeter). I am thinking maybe IAC motor?

 

[IMenriched]

No codes come up. I checked wiring, plugs, ignition, sometimes when I am sitting at a light it will start to idle rough and almost stall out, then it rights itself and starts running good again. I checked the TPS and it is good (voltmeter). I am thinking maybe IAC motor?

yes that would be a good place to start...remove and clean the IAC .

also check the fuel pressure to see if the FPR is working correctly