Hello everyone. I recently picked up a 1989 Chevy Blazer 350 TBI, 700R4 with 94K miles that is bone stock down to the stereo. It starts great and idles fine. Under hard acceleration it accelerates with no problems, but when cruising at very light to light throttle in 3rd or in OD it has a very light stumble, miss, shudder, shake that I can't really pinpoint. I don't know squat about the TBI system on these rigs as I've been a q-jet carb and efi guy my whole life. I've looked around at all the vacuum lines/PCV valve etc. Where should I start looking next? Is there a TPS on the TBI system, and if so where? Any ideas on where to look to fix my rig would be much appreciated. Thanks.