2002 Lexus ES 300 • 6 cylinder 2WD Automatic • 112,000 miles

I have a 2002 lexus es300. My problems started when I try to start my engine and it was struggling like the battery was low. I checked the batteries by removing and putting it back in. When I did that, the check engine light came on and now the rpm is going up and down. Please advise.
June 22, 2011.

Have a scan done and let me know the EXACT trouble code for the CEL indicating. Most parts stores provvides free scanning services.

Check the MAF and coolant level and ensure nothing was dislodged when disconnecting and connecting the battery terminals.

Jun 22, 2011.