Run the codes first PLEASE!! Nothing wrong with cleaning sensors, but dont get side tracked, from the most important part of diagnosing problems such as yours. Codes are free to do, and only take a small amount of time. If anything the codes will help you figure out what sensors to try and clean.I gave it a tune-up about 4k miles ago. fuel filters less miles than that. timings set to 12*. the problem only started a couple days ago. bolts are shorty headers, off road hpipe, underdrive pulleys, bbk fender intake. also all the tune up parts are msd. it has autolite 25's gapped to .045. i guess ill start by cleaning some sensors.
Very Good Suggestion:bigthumbsupAlso, you may want to check out your "salt and pepper" shakers - the black and white ten-pin connectors located on the back of your upper intake manifold. Cleaning these with a pick, electrical cleaner and some dielectric grease did me wonders and I was having a very similar problem.
While you're at it, you may want to use a pick to open up the male pins a bit to make the connection a bit tighter. Hope this helps! :bigthumbsup