I have a 1988 Chevy suburban with the 350 tbi in it. I had a problem where it idled fine, revved up good in park/neutral, but when you put it into gear and give it more then the slightest bit of gas is would bog down and stall out. I have since replaced the vacuum lines and checked the Egr. Egr is good and after replacing the lines I have gained roughly half my throttle back, but I've come to a stand still, I've replaced almost all sensors, tps, map, o2, Egr solenoid, and haven't had any changes. The cel is on for code 33 which google said was low vacuum to the map sensor. If anybody has any ideas/suggestions they would be greatly appreciated.