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I need a new brake master cylinder. Brake peddle will slowly go to floor and then brake light will come on. Any recommendations on vender? I have been reading about coverting to vacuum brakes. Any thoughts? Pros and con? My car is 84 gn stock. I plan to keep it stock.

84 GN, original. When I set the cruise control it will hold the speed but is does is with losts of throttle movement. I can feel the car surge, then let off, then surge again. The vac gauage needle fluctuates about 10 lbs. the ride is very jerkyt. It acts like the system is set to sensitive...

This is probably a dumb question from a new guy to the GN community. Are the intercooled cars faster than the HA cars? and if so how much? To go faster would be cheaper to just buy an 86 or 87 turbo car?

1984 stock gn. I was getting intermitten check engine lite. Malfunction said EGR. Other reading at idle. closed loop. thermo 174 knock sensor 235, then later 0, then later 9. Mass Air flow 6 gr/sec O2 at idle bouncing all over the place. 712, 246, 629, 242, 514, 1174

Does anyone know of a source for the Lear-Seigler fabric used on 84 GN? This question has probably been asked many times in the past and I am new to this web site and the GN world. Is the fabric available?

1984 hot air. The waste gate lever when disconnected has a travel of approx 90 degrees. However the when conneted the vacum actuator, I can only get the vacum actuator to move the gate only about 45 degrees. How much should the wast gate open? How far should the vacum actuator move the...

Fast idle at 1700 rpm. Scan tool says coolant temp 72 degrees-temp gauge says 150 to 160. I suspect that I have a bad temp sensor, am I on the right track? I don't find an IAC on the scan tool, it does have a Idle Air Mtr Pos that reads "175 steps". Loop status is "open". Throttle sensor...

Where is the idle adjustment? I recently installed a 160 thermostat and now the idle is fast. Unless I am putting my foot into it and repeatedly into boost the temp is at 160 or less, particulaly when the outside temp is cool. This is according to the temp guage. I wonder if the ecm thinks...

What is the best engine oil for hot air cars? 10w30 is recommend in owners manuel. What about synthetic? My car is stock with 126,000 miles-runs strong and does not smoke.

1984. Where is the detenation sensor (knock sensor)? Where is good source of wires and connectors for old GN?

Does altitude affect boost? If so how much? How much does octane affect boost?

I just bought 84 gn. It runs good, but I question if it is pulling enough boost. It is pulling between 7 to 9 lbs. What should it pull. CAr has 126,000 miles.