Replace the turn signal flasher relay.
There is a recall on the 2001 Malibu blinkers. I'm not sure exactly what had to be fixed but my Malibu was having the same problems but seem to work fine now. There is a recall on just about every late 90's to early 2000's Malibu. Even my 2000 Grand Am has the same recall! If I run the AC they seem to work again.It's weird It is probably a bad emergency light button. The blinkers are wired through it, so when it starts going out so will the blinkers. Its about $25 and takes 5 min to change.
Check the fuse
The library has an automotive section with manuals that have all the schematics.
Usually a bad hazard flasher module a common problem. Try playing with hazard switch.
I also have a 99 Malibu it also cuts out above 4000 rpm. I checked the plugs they are all good. It is a 3.1litre any suggestions? no
Check the fuse in the panel on driver side door
head gasket leak or thermostate needs to be replaced
check your fuel pressure.
a lot of 3.1 engines do this, if it is not severe then it should be ok...
First of all, if the check engine light is "ON" then that would be the place to start. If the fuel filter has not been replaced in the last 2 years then I would do that.
The coldness
Standard running temperature is 210 degrees Fahrenheit.