Join Date: Mar 2002
Location: Austin, TX, USA
I know if you disconnect a working MAP, often the engine will stumble and almost die before the computer brings the RPMs up to near 1000RPM. Your description sounds like those may be MAP symtoms.
Do you have a hanes manual or somesuch with a troubleshooting procedure? The reason I ask is that they might have a MAP diagnosis tree which will tell you how to determine if the MAP is working.
Off the top of my head, it seems like there are three wires. The outer wires are hot and ground. The center is a signal wire. If you put a hand vacuum pump on the port and monitor the signal line with a DVM against ground, you'll see a voltage signal that coinsides with the applied vacuum. The signal should be between 0 and 5 volts if you use the sensors ground wire as a reference.
If you have the tools to check give it a try. If the results don't jive with what I've described, try to locate the troubleshooting procedure (provided one exists) to make sure my recollection is correct.
Luck for you, if you want to reset the computer, just disconnect the battery for 30 seconds or so.
68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI