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XfireZ51 · 06-27-2013

Did you remove TB when you cleaned it? If you have a scantool, check the TPS v
with Ignition ON. Surging of the LT-5 is common when idling down in neutral and slowing down. This can be mitigated by flattening the Spark and VE tables in the
"Idling zone". I also change the IAC setting so the idle stays a bit high until it reaches Idle MPH. First thing is to determine there are no technical issues. I would look at the IAC counts at idle. Maybe MIN AIR needs adjusting.

06-27-2013	#12
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,685	Re: strange surge Did you remove TB when you cleaned it? If you have a scantool, check the TPS v with Ignition ON. Surging of the LT-5 is common when idling down in neutral and slowing down. This can be mitigated by flattening the Spark and VE tables in the "Idling zone". I also change the IAC setting so the idle stays a bit high until it reaches Idle MPH. First thing is to determine there are no technical issues. I would look at the IAC counts at idle. Maybe MIN AIR needs adjusting.