hold on
I fought a serging /electrical problem for a while and spent a lot more money than needed. So before you spend any more raise the hood and listen you might have a simple vacume leak. I had low volts, o2 codes, serging, and the car acted like it wanted to stall sometimes depending on how it felt at the time. And my hose that was at fault went to the EGR system, after $2 for a couple feet of hose she ran like a champ. Its so small but its worth a look.
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