So I replaced my intake manifold gasket on my 93 4.3 vortec, after doing so it started to run really weird once it’s warmed up, when I first start it it’ll run completely normal until it’s warm and I start driving. Then it will start misfiring so bad. I timed the distributor to 0 degrees at 750 rpm’s. I checked the code it was code 34 and 42. I assume it’s a sensor or something, but I’m not knowledgeable enough, I’ve tried pretty much everything I can think of, I just need some tips on this, thanks