Revs bouncing between 2k and 2.25k

  1. My model of MX-5 is: 1990 eunos
  2. I’m based near: Nottingham
  3. I’m looking for technical help or recommendations on: Revs bouncing

Hi guys, I’ve recently repaired the t fitting on the lower thermostat housing (as per last post I tapped a brass fitting in and moved the t down). I replaced the thermostat and thermostat gasket whilst I was in there. I now have a few issues.

I’ve ran the car up to temperature a few times the fittings don’t seem to be leaking. Something I have noticed is when I’ve given the car some revs on the drive to make sure everything holds, if I hold the revs just over 2250 they drop to around 2k and then bounce between the two. If I put my foot down I can push past the 2250 but would ideally like to sort this before I try to drive the car. the car is idiling just below 1k

Any advice as always will be much appreciated.