engine rough idle

[chinnesse]

hi all i have a 136000 98 Safari we use to get around , It started idling rough suddenly no reason
it run great and it happens once in a while not all the time . It doing more often know . Any ideas
like today it stated okay after a short while it started with the rough ideal.

[LiftedAWDAstro]

Do a tune-up...plugs, wires, cap, rotor and possibly a coil unless they were just done in the last few months.

[kings-x59]

check the wire boots on the spark plugs to make sure they are seated well.

[Rileysowner]

I'm with Lifted on this. If you have not have the plugs, wires, cap and rotor done, do them. I had similar problems before I did that, and it solved them. Also, stick with the genuine AC Delco cap and rotor, as with anything else you will be replacing it in a years time. BTDT.

[chinnesse]

Did wires oil, air,filter pvc valve to 2 month ago rotor & cap . It just started suddenly beside that any other ideas . It a bit annoying when waiting for light beside that dosent fill like its missfireing

[rlsllc]

Pull the engine cover and see if it still persists. Carefully check the routing of the wires, particularly the coil wire. The coil wire can arc to the motor cover, trans dipstick tube, etc. Easy to see at night (dark) with the motor running. Even new wires can do this if misrouted.

Could be a weak (and getting weaker) coil. Same symptoms.

You may think about cleaning the EGR valve, although these throw check engine lights usually.

[Smiliesafari]

Check the motor mounts. Mine were so bad that the engine side of the mount was touching the frame. It felt like it was a rough idle when actually it was the engine vibration transfering to the frame.

[chinnesse]

good one sound interesting could you feel it when you where driving or only when you were idling or waiting for light.

[Smiliesafari]

It was terrible when the van was just sitting still like at a traffic signal.

[rlsllc]

Check the motor mounts. Mine were so bad that the engine side of the mount was touching the frame. It felt like it was a rough idle when actually it was the engine vibration transfering to the frame.

Good thinking! I forgot about that one.

[chinnesse]

Will be checking out this weekend hopefully it one of this will let you all know what happens.