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1991 Corvette ZR-1 · 12-08-2023

Another item to consider is the MAP sensor, which is on the back of the plenum. It has a plastic hard line that attaches from it to the back of the plenum to read vacuum. These cars do a decent job at keeping the plenum pretty wet with oil. What can happen is oil gets in that line and obstructs the sensors ability to read vacuum.

Also possible that if the plenum has ever been off, that hard line was compromised. So what some will do is just use a rubber hose to attach to the plenum and the sensor. That was the case on mine. Literally the first time out driving the car and it stalled out at a light. I eventually found a replacement rubber hose on the plenum to the MAP sensor and the line was compromised from the oil soaking through it. Replaced with an actual hard line from Jerry?s Gaskets and the stalling problem was gone. It always happened when coming off the gas and on the brakes a little to make a turn. Car would always die mid turn.

12-08-2023	#13
1991 Corvette ZR-1 Join Date: Sep 2018 Location: Florida Posts: 297	Re: Stalling sometimes at stops? Another item to consider is the MAP sensor, which is on the back of the plenum. It has a plastic hard line that attaches from it to the back of the plenum to read vacuum. These cars do a decent job at keeping the plenum pretty wet with oil. What can happen is oil gets in that line and obstructs the sensors ability to read vacuum. Also possible that if the plenum has ever been off, that hard line was compromised. So what some will do is just use a rubber hose to attach to the plenum and the sensor. That was the case on mine. Literally the first time out driving the car and it stalled out at a light. I eventually found a replacement rubber hose on the plenum to the MAP sensor and the line was compromised from the oil soaking through it. Replaced with an actual hard line from Jerry?s Gaskets and the stalling problem was gone. It always happened when coming off the gas and on the brakes a little to make a turn. Car would always die mid turn.