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Sorry if you have seen this post, decided to re-post it under this forum. I greatly appreciate all help and advice I receive. Great thanks and shout out to all the informational posts and DIY threads!!! Saving me my much needed $$$

Hey I have some problems with my engine hunting (or revving up and down when the A/C is on). Decided to replace coolant and burp the coolant to free all air bubbles, (has 175,00 miles and I just bought it, figured that it has never been changed so I would start with this). Did not work.

1st question: After completing coolant change I filled reservoir tank. The problem was the reserve/overflow tank was so dirty I ended up filling it almost to the top, about an inch or two from the cap. Should I drain it so that it is in between the min/max lines or can I get away with leaving it high?

2nd question: The next thing I will be doing is cleaning the IACV to try and fix this revving problem. Wondering if anyone had any other tips besides doing this.