I have a 1992 Chevy C1500 w/ 4.3L(V6) and manual trans.
My truck just developed a rough idle this week .

My problems originaly started when my EGR went bad and I replaced it about 2 weeks ago.
I replaced it and the solenoid with an after market one (Auto Zone) and found that the problem got worse I eventually bought a AC Deloco OE EGR & solenoid and all seemed well until this week when I started feeling the idle a little rough,
Now I have gone ahead a replaced the Dist.(cap & rotor too), plugs, wires, coil and IAC and still nothing has changed. I have even chaged the sparkplugs and wires twice just in case and still nothing has chnged.
I still have good power and I do not notice any problems while driving just while sitting at idle or in nutral (no boging)
Is there somthing that I am missing ???? Please help

I have a '93 and have experience this also. Here's what I've noticed: The idle is smooth when the engine is cold. I also notice the volt meter sitting on about 13.99 volts. However, when it heats up, the volts meter drops and the rough idle gets worse. I wonder if this is an charging problem because the volt meter bounces when I turn on my blinker or witpers. I have also replaced the cap, rotor, plugs, & coil, but you mentioned the EGR. Where is this because I don't find one on my truck?

I have a '93 and have experience this also. Here's what I've noticed: The idle is smooth when the engine is cold. I also notice the volt meter sitting on about 13.99 volts. However, when it heats up, the volts meter drops and the rough idle gets worse. I wonder if this is an charging problem because the volt meter bounces when I turn on my blinker or witpers. I have also replaced the cap, rotor, plugs, & coil, but you mentioned the EGR. Where is this because I don't find one on my truck?

The EGR is located right behind the TBI just in fron of the dist. .
It has two bolts that mount to the intake

The EGR is located right behind the TBI just in fron of the dist. .
It has two bolts that mount to the intake

I looked last night and can't seem to see what exactly is getting recirculated. It seems to be hooked up to itself. My Chilton Manual sucks and doesn't show a good veiw of how its connected. Do you know where I can find this?

I replaced the EGR and finally figured out it was all hooked up correctly.
Still runs rough. Maybe I'll replace that thing distributer.

Have you checked to see if you have a weak coil ?

Have you checked to see if you have a weak coil ?
I replaced it with a new one from MSD.

hey guys i got a 88 4.3 manual to.. and yes my idle is rough i donno what it is.... the hole truck shacks lol guys i think v8 is the way to go lmaoo... umm i always wanted to fine a guy with a 4.3 standard like mine cuz when i drive lik ein first or whatever and tap the gas something hits its as if the gears slap together or something .. like if i keep tapong the gass its fucked just keeps slapping .. i dont no how to explain it but if anyone understands than please help lol .... thank you

hey guys i got a 88 4.3 manual to.. and yes my idle is rough i donno what it is.... the hole truck shacks lol guys i think v8 is the way to go lmaoo... umm i always wanted to fine a guy with a 4.3 standard like mine cuz when i drive lik ein first or whatever and tap the gas something hits its as if the gears slap together or something .. like if i keep tapong the gass its fucked just keeps slapping .. i dont no how to explain it but if anyone understands than please help lol .... thank you
Slapping is probably bad u-joints, wore out rearend, or broken transmission mount.