Been chasing a rabbit down a hole with my wallet on my '97 Tahoe, 5.7, 150K miles. It started to run really roughly, missing and coughing even some backfiring through the exhaust. Finally threw a code - intermittent misfire in cylinder 2. Through work, I managed to score a service bulletin stating the spider injectors are a known problem on these. Things I have changed: New MAF sensor; fuel filter; new plugs (gapped at 60), wires, cap and rotor; new PCV valve and finally new spider injectors - what a chore that was! Also pressure tested the fuel system - it's running a constant 54-55 (It should be around 60 but I've read the pressure really doesn't start interfering until it dips below 50. Also, the pressure stays at 54-55 for over an hour before it drops, after the engine is shut off). Also a new coil. Thoroughly cleaned the throttle body while I had everything apart. Also the plastic intake had no noticeable cracks or other issues. It's running about 95 percent, but when taking off from a stop, it still coughs and sputters a bit - it's not always a smooth acceleration. This seems most pronounced when it's warm. When cold, it seems to run like a new truck. It isn't currently throwing any codes. I'm starting to run out of ideas, other than O2 sensors (no codes), distributor and fuel pump (still). What am I missing?