2g nt wierd temp rise

[750_sport]

2g N/T
Car just rolled 90k miles.

Car ran low on oil still was at half full.
Did a oil change, small brass flakes in oil. Not a lot and not very big, You could see them pouring the oil out shining a flashlight through it.

Now
3rd or 4th gear pulls are fine
take off in 1st and run it out to 5k rpm and temp gauge rises. Then it will rise with throttle
and go back down with throttle, almost at the same time.

I bled the cooling system at first before hand I had small bubbles and idle. I then topped it off and let it idle for 15 min with the heater on then topped it off again. add cap

Same thing happen again

Comp numbers are 205, 210, 210, 185
Spark plugs looked great, Nice tan color.

This has never happen before, and the car never got to 3/4 on the temp gauge.

I'm stumped. No tapping or knocking noises....
Was thinking about pulling the pan off and swapping out crank and rod bearing, maybe a headgasket as well....

 

[750_sport]

Well had to tow car home lastnight

On the way to work at idle car started missing.

Didnt risk anything, No over heat, Temp gauge in middle or just below.

I get it home and with a comp gauge I'm getting 210 207 211 210
Car just rolled 90041 miles

I give up!

Looks like maybe a blown headgasket, coolent was low and the plugs had a very faint light green color on the tip.
So maybe a headgasket and a pull the oil pan inspection.

In the mean time I now have to drop the motor in my MR2 and drive it around.