My car wont go over 45 mph & doesnt accelerate

mikekane0982
Thu, 22 Apr 2010 02:57:40 +0000
Maintenance/Repairs

i have an 1992 infiniti q45 I replaced the cats some coils,fuel filter,maf sensor,spark plugs, My car had this problem in december and I replaced all that I just listed.but now it slowly has gotten worse then before.It has good gas pressure.the fuel pumps good.Theirs no check engine light on.The newest symptoms are it doesnt accelerate at all.I cant get it to go over 1800 rpms if I try it bucks or has no response.and the longer the drive the worse and worse it gets.I eventually cant go no more.It comes to a crawl to 30 mphs at 1500rpms.It has a rough idle but its not that bad.If I rev it in park I can get it to go up to 4000rpms but quickly goes done to 700 rpms and then wont go back up unless I take my foot off the gas.Sometimes it runs alittle better but not often enough to count.No one can figure it out since theirs no check engine light.Before I changed the MAF SENSOR it was blowing out alot of fumes,not oil or anitfreeze but emissions or fuel.but I changed that and now it doesnt do that anymore.And Im sick of getting ripped off.So please help me out in anyway.Has anyone had these similiar problems?Does anyone know what it could be?

10 posts - 5 participants