I have a 89 22re, so why when I start it the rpms are around 2000? once it warms up it idles around 800. also after I start it half way before it is fully warmed up i hit the brakes and the rpms cut out then go high , repeat.(this is due to the rmps being too high, I think) any suggestions? my 87 22re starts up perfect and idles at 750 all the time, cold, hot doesn't matter.