Poor Performance after storage

[aussieboxy]

Hi all,

I had my 2.7 in storage for about 18 months & the battery went flat. So I figured the ECU would need to to learn again but it has been a few weeks of constant driving, some highway & some around town.

I have been giving it a bit of stick as you should, & it still seems to be under-performing, & has a flat spot at around 4K rpm.

I have changed the oil & air filters, ran some injector cleaner through it & cleaned the MAF but still the same.

Coughed & spluttered a lot when 1st started up but no issues now.

Any idea's what else I can check.

Thanks