could be leaking injectors. can you get a fuel pressure gage to see if your pressure drops off, or a scanner to kill the injectors one at a time?

Ever get a resolution? I have the same problem, same year make and model. I've done a full tune-up, even replaced the fuel pump. Problem still occurs.

I'm haveing the same problems running lean in bank 1 and 2 and a random missfire code I have no idea what to do about it. I'm taking it to the local dealer for service pretty quick if I can't get the problem resolved. please help if you know what I can do.

There are three kinds of gasoline engine misfire scenarios, first there is the "under load" misfire and there is the "at engine idle" misfire, and finally there is misfire continuously. All engine misfires exist because one of three things has occurred. First, a cylinder has lost compression, a cylinder needs a certain amount of compression to operate correctly. Second, the ignition system has failed or is failing intermittently, spark is needed at the time of compression to ignite the fuel air mixture. Third, the fuel air mixture is incorrect, proper mixture is needed for the ignition system to ignite fuel properly. If any of these conditions occur in the engine, the engine will misfire. 1. Low or no compression can be caused by a. burned or leaking intake or exhaust valves b. worn or broken piston or piston rings c. worn out camshaft d. wrong weight motor oil was installed holding the cam followers from adjusting e. broken valve spring f. failed head gasket. 2. Ignition system has failed or is failing a. spark plug has fouled or is worn out b. ignition coil has failed c. spark plug wires have shorted e. engine control module coil driver has failed 3. Fuel/Air Mixture is incorrect a. vacuum leak at the intake manifold b. fuel injector has failed c. EGR valve is stuck open d. mass air flow sensor has failed e. oxygen sensor has failed f. air intake boot is cracked common problems: 1. fuel injector has failed or is failing 2. spark plug wire has shorted 3. spark plug is worn out or is cracked 4. ignition coil has failed or is failing

I had the same problem with my 96 Chevy Silverado , Chevy garage suggested replacing the fuel meter body, also known as the spider injector ,which controls the delivery of fuel to each of the eight cylinders. It cost $307.00 at OReilly / the first one I put in was defective. I returned that one and replaced it, now the engine runs perfect.

i had the same problem and had it in the shop they said i had bad injectors,well 600.00 later on the way home it happened agaiin, my check engine light came on and started flashing, same codes multi missfires, I started checking and fond the mapp sensor plugged up, it was giving the wrong intake pressure which was screwing with the fuel delivery and timing hope this helps

I also have a 1998 Chevy Silverado 5.7. Mine has 130000 miles. Mine surges until it reaches about 65 mph or when accelerating, then it runs great. I get no codes on mine. It's been tuned up and I replaced the fuel filter, fuel pump and 02 sensor. And still has the surging. I guess my problem is the opposite of yours. Mine goes to the shop Monday unless I some how get it fixed by then. Good Luck with yours

I say all of us that have these Chevy's with these problems should sell them and buy a Ford or Dodge HAHA

I had similar problem with my 02 suburban. Turned out to be a vacuum leak. It was a bad intake manifold gasket.