My husband replaced the starter in our 1999 Lexus
RX300 and now it's not wanting to accelerate and
randomly shuts off
The starter has nothing to do with your issue. Have him recheck his work, either he forgot to plug something back up or bumped or broke a vacuum line or wiring.
Check engine light on?
Yes check engine light is on and while car is running it smells like gun powder burning
Have the codes read and report back before buying sensors.
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