Ok first the info it's a 94 trans am with long tubes, tb bypass, and msd coil and opti that have around 2k miles on them the plugs and wires have around 4-5k on them. Now on to the problem it has seemed to me that it has been idling just a little rough for aa while now but always smooth off idle but just recently it has been stumbling off idle and staying rough to around 2k then smooths out and it does this intermitently also when it starts doing it the idle starts dropping slowly almost like it slowly flooding. So i scanned the car with my snap on scannner and really didnt see anything that stood out other than the MAP sensor is showing around 10 inHg at idle which my mityvac is showing 20 inHg at idle. I checked KOEO and the MAP sensor is showing the same as Baro at 29 which is correct for this area. So is my MAP sensor failing in range and would that cause my stumble? Also i am getting BLMs at 117 and 112 if that helps and O2s appear to be responding quickly. I really cant afford to throw parts at this and I'm not going to so good input is much needed. Thanks in advance. Also no codes.