my 87 gta is stalling when hot, but restart pratically everytime. when cold its okay, i have bought the car last week. he have a aftermarket air intake ( but just the air flow on origin tubing), and he gave me code : EGR, MAP sensor low and high voltage, and ignition error. i've disconnect de IAC sensor, and it run a little bit more better but still stalling. help me please

 

Heatsoak. Also throwing a bunch of codes like that I would check your alternator and make sure it is pumping out I believe 13-14 volts to the battery. Also stalling when hot could be a lean issue which in turn is linked to the IAC, MAF, and EGR.

 

The gage in dash indicate 13 volt steady ,...

 

Cool, now check all your electrical connections for the sensors, something could be loose that is causing all the codes to pop up; also reconnect the IAC; not a good idea to have it disconnected considering it will tell the computer to richen or lean the fuel mixture based on air temp.