Stalls when I slow down. stalls when I start it after the engine is warm. replaced throttle position sensor. no luck. wtf?

Idle air control valve

Yea , those crossfire injection vettes can be a bear sometimes . I had dealings with them 84-85 - 86 working as a tech at a chevy dealer . Don't remember much about them , haven't heard anything about them for long time .

How's the fuel pressure ? Have you put a fuel gauge on it ? I would imagine you don't have a Tech 1 scan tool ? What's the map sensor voltage at idle ?

1984 Corvette hesitation stalling stumbling During Warm Up Only

1984 Corvette cleaning checking the check valves

Have you had it to a shop that has a professional type scan tool that can view engine sensor data parameters ? Do you know what those are ? Idle air control counts , mass air flow sensor data , MAP sensor , TPS - throttle position sensor , crankshaft position sensors , Cam sensors , engine coolant temp , intake air temp etc......

Sounds like a possible throttle positioning sensor.

Idle sensor or throttle body positioning sensor

Possibly the throttle position sensor. Easiest way to test is connect a scanner and go to real time data mode. With the key on,press the accelerator slowly and watch the throttle position change on the scanner. If it doesn't register a change when you start opening the throttle, replace the sensor.

throttle position sensor , or mass air flow sensor.

Sounds like a throttle position sensor sticking in a very dangerous position. The throttle position sensor does exactly what it sounds like. Senses the throttle position and sends it to the injectors, if the position sensor is sticking open it is a very dangerous situation. Get your vehicle to a mechanic and have them scan the check engine light and besure that is the issue before going any further, but that is your most likely answer, Good Luck!

Most common cause of stalling for Lincolns in that era is the TPS (Throttle Position Sensor). It regulates fuel mixture, idle speed etc. A bad TPS will usually act up in one of two ways:

1. When cold, car continually stalls
2. When warm, car stalls when slowing down (especially if AC is on)

As far as valve cover oil leak, it's a problem that should be addressed to keep oil from fouling your spark plugs but highly unlikely to be the cause of your stalling problem. Hope this answers your question. All the best.
Greg

You may find the throttle position sensor (TPS) needs adjusting or the throttle plate is gummed up and not closing completely. The other two possibilities are the coolant temp sensor and air temperature sensor.

Run a diagnostic per the following:

here