Battery / abs / low coolant light on when drive hard

[MetalSlug]

My 98 GT whenever I drove a little hard those check engine light come up then when I slow down it goes away? Alternator?

 

[eljefino]

Does it do it if you just rev it in neutral?

 

[andrew_j]

Sheer guess fan belt slipping.

 

[GSCJR]

Test your battery and connections before condemning the alternator.

 

[Drifter]

Test your battery and connections before condemning the alternator.

And check grounds

 

[oldhp]

Maybe the little horse is just tired.

 

[MetalSlug]

Does it do it if you just rev it in neutral?

Yes

 

[MetalSlug]

Maybe the little horse is just tired.

Imma try take care the best I can, until engine give up, I will coyote swap it.

 

[Skippy722]

Voltage regulator maybe? Voltage gauge is a bit high and computers can act wonky if the voltage isn’t stable.