Running rough when cold
My 96 3.9 dakota has just recently begun to start acting up, when its cold it barely stays running and backfires through the intake, if I floor the gas it will rev up but anything less than full throttle and it pops and sputters.
Once its warmed up it runs fine, I replaced the coolant sensor thinking it must be the cause but still does the same thing and its not throwing any codes except once in a while I get a code 31 evap sol.
Also has had a complete tune up, new timing chain and water pump.
Only other symptom is long cranking time like 3-5 seconds but it has always done that.
I was just hoping somebody else might have had a similar issue and could point me in the right direction