for quite some time now (months :O ) my transmission is not catching until 40, or 70mph, anything in between it revs way up to 4000+ until it shifts, always at those two speeds. but at 40 and 70 it runs at normal rpms and seems fine, when it first started i took it in to have transmission fluid replaced..they told me it was just fine, ive tried stop slip, did not effect anything. and every so often when i come to a stop sign, and then reapply the gas the car keeps lurching forward as if it was running out of gas, violent jerking forward. the check engine light has been on the whole time too :S any suggestions? could be multiple problems...i have no idea, i have no knowledge what so ever about cars thanks for your help, any is appreciate