GMC Repair: 96 gmc jimmy, port fuel injection, cpfi

Question
how do i change or clean my cpfi. i did research and got a code of random misfire. if you run the engine hard it runs fine if it is at 1500r.p.m it misses. all the answers i got led to this. so...do i clean it or change it. please help,it is driveing me crazy and costly with new parts i dont need.

Answer
General Motors implemented a system called "central port injection" (CPI) or "central port fuel injection" (CPFI). It uses tubes with poppet valves from a central injector to spray fuel at each intake port rather than the central throttle-body[citation needed]. Pressure specifications typically mirror that of a TBI system. The two variants were CPFI from 1992 to 1995, and CSFI from 1996 and on[citation needed]. CPFI is a batch-fire system, in which fuel is injected to all ports simultaneously. The 1996 and later CSFI system sprays fuel sequentially.

 The experience I have had is that your "spider" is going bad. That is about $300. If it were me, I would go to a Pull-a-part yard or salvage yard. I hate the be the bearer of bad news. I do encourage a second opinion, but if you do not the problem will persist and eventually get worse.