b16a1 furst gen on a 90 hb si

why do i have an high idle its at 2K..what could be the problem..could it be my intake manifold? im using an intake manifold off an 99 si b16a2 and its on a first gen b16a1..?vacuum issue? need help..also will the cable clutch off my 90 hb si work fine or will i have to use the one off an 90-93 teg..cause at first everytime i shift into gear it would be hard then on reverse ti would grind like crazy...then i tighten clutch cable really tight then it would work for a bit!!any info on that ..please help

 

A manifold will not give you a high idle, but a vacuum leak would. Or you tps might be set wrong. If sounds like your clutch cable works now and then, so something else might be wrong. You have have a high idle all the time right ? If so then thats why the gears are grinding. Your trying to go in reverse at 2k rpm's.