Hello! I have an 05 Dodge ram 1500 5.7 hemi, 35,000 miles. On a cold startup only: the engine fires up quick and idles perfect for a few seconds. Then the idle gets "lumpy" although the tach does not reflect it, I can just feel the truck bucking slightly. When I put the truck in drive it bucks terribly under acceleration, misfires, and barely runs for about 20 seconds (give or take a few). Then suddenly it will clear up and smooth out and run perfect from then on out, no matter what distance. If the motor is still warm it will restart perfectly. The truck will throw the emission control light, sometimes it will even flash. The code is multiple cylinder misfire. I have replaced the egr valve, cleaned the pcv valve, ran fuel injector cleaner, checked for vacuum leaks, inspected the plugs (gas mileage is a consistent 14mpg). I am out of ideas, it started this problem a couple weeks ago out of the blue. It will run perfect for a few days then start running poorly again. I have done a lot of research and cant find a definite answer, and I do not want to take it to a shop. Any suggestions are greatly appreciated!!
Thanks!

 

Welcome to the board.

If it were me I would take off the TB and clean the backside of it with non-chlorinated brake cleaner. Now I dont think that will resolve your issue but it might.

However, I feel more that it is a fuel injector issue myself. I know you have run FI cleaner through the truck but Im talking more of a physical problem with an injector.

Thats my thought.

 

fuel injectors would give it more than likely a hard start.
emission control lamp? are you talking the lightning bolt?

 

The emission control light is the one that looks like this:

its on the left side and top of the gauge cluster. I wouldnt think it was an injector only because it has no problems top end, only for a few seconds on cold start up. Thats my thought, but I have been wrong before!!

 

that the MIL lamp ( amlfunction indicator lamp) its not an emission light. although it could be something do do with emissions.
get a code reader and see what your codes are

 

Sorry, your right it is the "mil" lamp, I got emissions stuck in my head from reading the sevice manual. The code is P0300, multiple cylinder misfire. The potential causes I found online were: egr, vacuum leak, wires, plugs, etc. The code doesn't specify a specific cylinder and I replaced the egr, then checked plugs, wires and vacuum lines.

 

There are lots of threads in P0300 around here. It can range from several different issues that are all simple usually. Go under the truck and look at the evap canister in front of the fuel tank also. Check it for cracks in the container and hoses. Are you sure you do not have a code for a specific cylinder?

 

I checked it with the scanner every time it puts up the mil, each time it gives the random cylinder misfire. It has ran fine for days, but when I started it up today after work it ran so badly that the truck couldn't even pull out of the parking lot and the mil lamp was flashing like crazy. Twenty seconds later the lamp went off completely and the truck ran fine the whole way home. I guess I'm going to have to break down and take it somewhere.