i have an 87 4runner 22re. this used to be a freak occurance but i seem to be noticing it more and more these last few weeks. sometimes when i start my car (dosent matter if its cold or warm out) my engine idle drops down to about 500rpms. and my shifter shakes like a mofo. after driving for a min it seems to work out the kink, but has anyone else had this problem?