Hi All,
New member, apologies if this has been covered in another post, however a search has left me still with an issue.

Ive got a BA RTV which has a donor BOSS 260 engine. has been running great until recently when it has begun surging at idle. basically it will surge to around 1100 rpm at the slightest touch of the accelerator, will sway between 1100 and 900 rpm for about 10 sec until it returns to normal idle around 700 rpm ish.

Ive replaced the inlet manifiold gasket which did have a small leak, replaced the throttle position sensor and have reset the ECU and done the ECU and TPS reset as posted by 1 SLY 97EL {DESCRIPTION}, however there has been no improvement so far.

Any suggestions would be great, TIA.