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It’s been a few months since I bought my Lexus IS300 from my brother in law at first I noticed it would pull back and release a little when I would go 5-15 MPH and now since I’ve gotten a more comfortable going at a higher speed when I accelerate faster it lags and releases and shoots me quick. Any ideas what’s wrong? I want o start fixing it up but I wanna get this down first thank you :)
 

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Is it throwing any codes?

Hard to know for sure, falters could be coil packs or o2 sensors, could be injectors, MAF cleaning needed or something else. Need to see what if any codes the ECU is putting out and start with that or a few basics
 

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It’s been a few months since I bought my Lexus IS300 from my brother in law at first I noticed it would pull back and release a little when I would go 5-15 MPH and now since I’ve gotten a more comfortable going at a higher speed when I accelerate faster it lags and releases and shoots me quick. Any ideas what’s wrong? I want o start fixing it up but I wanna get this down first thank you :)
Do you have an automatic transmission? It could even be the accumulators acting up.

I'd put my money on the engine first, but like pnut mentioned, more information is required
 
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