My 2003 chevy venture idles rough when i starts

https://www.youtube.com/watch?v=M7M6DSwxZZE Sounds like a fuel problem. Can you heat the fuel pump run? Need to hook up fuel pressure gauge to see pressure. Could be relay or pump.

How long since overall tune-up? Any applicable trouble codes?
The basics for a rough idle, check for a leak of some kind, fuel--egr--vacuum, something of that nature. Does it run ok off-idle?

Robert, have vehicle scanned for diagnostic codes. Check for vacuum leaks and if you have not done recently give vehicle a complete tune up cap,rottor,wires,plugs,filter's,etc, including injector/throttle body cleaning. Check the attached links,instruction and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."

1999 4 3 misfiring
2001 4 3 v6 1999 2006 2007 2013 Chevrolet Silverado GMC Sierra 1500
Trouble starting and rough low idle no codes My 2002 1500 Sliverado 4 8L...
Internal Faults in Distributor Can Cause Engine Problems Chevrolet S10...

Does the truck seem fine when you first start it & then acts up when it reaches operating temp?
That would lead me to look at my oxygen sensor, a bad sensor can cause the truck to run "rich" which would explain the fuel smell in the exhaust.

Nope! Why don't you give the mechanic a tune to see if it's running rough because of lean mixture, fail ignition coils, worn spark plugs....could be one of those things. Because when yours is rough at idle, it means the mixture is not right, more likely be lean or one or more cylinders not igniting properly. Got nothing to do with harmonic balancer. But do check motor mount for cracks, but faulty mounts only give you excessive movement that you can really feel it KICKS when you change from P - R - D.

Low fuel pressure....bad plugs,wires,injectors.. intake leak.....etc..try a new fuel filter first.....

be checking the fuel filter.. and the auto shutoff relay..

if u have a damaged plug it can be running on 1 less cylinder ,it will idle very rough,change it!

Well you don't say what engine it has. I just had to put a helicoil in the head of a 3.4L 'cuz it had pulled the threads out of rocker arm bolt hole for cyl. #3. Car ran great afterward.

I had the same issue with my venture. It turned out to be the number 5 plug wire, backside of engine ended up breaking out of the plug carrier and burning in half on the manifold. Your best bet is to trace all the wires to start off with and change the plugs. If that doesn't help, it may be internal. Good luck