Ignition module?

I've replaced the belt tentioner and the belt keeps coming off. What should I do? 2nd question. Do I need to disconnect the battery to replace the ignition module?

Here's my dilemma: I'm wanting to install a part that I can't, nor anyone else I've asked for that matter, seem to find. I'm looking for the location where the Electronic Spark Controller (ESC) is located on my truck listed above K1500, 5.7L V-8, Auto transmission. It's the last piece, other than a new computer, to try and fix the problem I've been having in regards to engine bog down when it gets hot or when it's humid. I've been looking for this holy grail all morning and have asked numerous local mechanics as well all with the same result. Help! Lol and thanks in advance. :)

Why won't truck accelerate and why does it now sift 500 to 1000 rpm higher than normal?
I replaced fuel pump and when I went to start truck it ran for about 20 seconds and died, it did that three times and then would'nt start anymore. I towed it to shop. They said it was the dist. When I got it back it ran but I had no power, shifting is now about 1000 rpms higher than it should be, power locks no longer work, and if the truck even sees an incline it starts slowing down. Before changing fuel pump the engine ran great. My scan tool said the ECM was in limp mode but the engine never ran better. Now, after reman dist. Ha sbeen installed (by shop)I I get code 42 Electronic sparks advance and ECM in limp mode. I installed a reman ECM last Thursday but I still have no acceleration above 30 mph. I sure could use another opinion, that is if any of this makes sense to ya. Thanx

When I went to pick up truck the repair order said that they set timing at 2 deg adv. Which brought the idle up to about 900 and the cat. Converter plug ( about 2 inches in dia.) Had been popped out. I had to seal that hole due to noise and I asked them to set timimg to 0 deg. He said he does that alot, to try to make for chain stretch. So when he reluctently agreed to reset it he disconnected a brown wire connector on firewall, pass. Side, right at corner of engine. But he disconnected it while engine was running. Isn't that a no no?

I agree. So now we're back to my original problem and question which has to do with lack of power

I have a snap on scan tool and have had it connected while driving. From what I've read and what I see on screen it appearsthings are normal. You would'nt happen to have operating specs so as to compare with scan tool real time numbers?

Would ya know why its not shifting at the proper rpm under normal acceleration?

I replaced the O2, now I get code 42 Electronic Spark Timing, can ya assist me?

I would like to know where the ignition control module is. Or the igniter. Have problems truck is not firing. Engine was a 305 the guy I bought it from put in a 350

1993 chevy silverado, v-6 2 wd 220,000 miles, manual transmission. I have replaced 2 ignition modules in about 20 miles of driving I am stumped as to what could be blowing them I have put the silicone gel on both and have also replaced the coil. I do believe the starter is bad but don't know why that would have anything to do with it.

Nosworc,
not sure what your problem could be. My question is how do you know when the ignition module goes bad? I've got an 88 and was wondering if that could be my problem as well.