1999 ram 1500 5.9 rough idle - DodgeTalk : Dodge Car Forums, Dodge Truck Forums and Ram Forums
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#1 Old 04-21-2013, 02:25 PM
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Question 1999 ram 1500 5.9 rough idle

I have a 99 ram 1500 Sport with a 5.9. When I start the truck, everything runs fine. After about 10 min of warm up, it will sometimes start to run rough at idle. I will be sitting in the truck, and it is running fine, and then all of the sudden starts to run rough. It happens instantly just like that. If I turn the truck off and back on, that sometimes fixes it for a little bit, but it does happen again eventually. The only codes I get are for random missfire. Seems like it is running really rich when it starts to choke. I can hear the IAC sucking a lot of air too. Thanx in advance for any help you guys might have!
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#2 Old 04-22-2013, 01:11 AM
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How long have you had the problem. Replacing IAC should help its 30 bucks so worth a shot. My dodge has always smelt rich when first started
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#3 Old 04-22-2013, 08:00 AM
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The only codes I get are for random missfire.
Have you gone over the ignition system? When was the last it had new plugs cap & rotor? Did you check your plenum gasket? I'd check and see what kind of fuel pressure you have also.
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#4 Old 04-22-2013, 11:56 AM
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A 2nd request to look down into the plenum, I rebuilt mine on the 5.9 durango.
The other thought is the ignition coil get old and the heat buildup can wear it out.

2012 Challenger SXT+ 220ci 5 speed, blackberry pearl, FM xxMM, diablo in-tune I1000, Carbon fiber pedal covers, 11% tint

1999 Durango SLT+ leather, 360ci 4x4, hughes plenum rebuild, superchips 3865, tow pkg, 3.55 LSD, rear tail light guard, K&N CAI, FM 50MM TB, crystal clear headlights, Torsion/shackle lift, Rancho RSX's, Pacesetter headers, dual trans & oil temp a-pillar pod, chrome deep trans pan, drilled & slotted rotors, 10 disc cd changer.

2004 Ram 1500 SLT 2WD QC LB 345ci, FM 84MM TB, slotted brake rotors, step bar, diamond plate pedals, locking gas door, tow package w/ 3.55 lsd, Hellwig LP-15, shell and carpet kit, 18% door window tint, Magnaflow 12641, Slammed1's 3" spindle lift and 2.5 coil spacer, rear lift shackles, Airraid MIT, superchips 3815, 6K front winch & custom Winch Plate, Autometer phantom trans gauge mounted in Mopar SRT A-Pillar single pod, lumber/roof rack, Rancho 9000X shocks, ATS fender flairs, 1" BL, gap guards, black grille, silver painted bezel(soon 2b white)
Next: HD rear lift bags

Gone but not forgotten 93 factory freak CC dakota lifted 4x4 318
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#5 Old 04-24-2013, 01:44 PM
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Ignition system should be fine. I have tuned up the truck several times since this problem has been occurring with no difference. I haven't checked the plenum gasket and will definitely try that. Fuel pressure is fine with the new fuel pump installed last summer. I installed a new IAC already and no change. I was wondering about the crank sensor......?
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