My uncle has a civic 1.6 16 valve and he's been having some problems with it he is out of the state so I'm limited on being helpful he says that while he drive is and it runs good but when he takes off and he gets to about 1500 to 1800 rpm it starts to shake and jump so he has to accelarate harder to get passed that and after he gets passed that and is driving at whatever spped limit is posted and lets go of the gas he says it feels like it kind of falls frontward he has replaced the iac valve and his distributor I think it might be his map sensore going out but what do you think let me know asap thanks

Do you have access to a diagnostic scan tool?
The information an up-to-date scan tool can provide will save you time and money.
It can point out what parts are working and what parts aren't working properly plus you save money by not replacing things that don't need replaced.