rpm's go up when stopping n doesnt sound right. on 1999 Chevrolet Blazer

when stopping rpm's go up, and engine is forcing truck to go. when in nuetral rpms go higher yet n also when in park.

Asked by for the 1999 Chevrolet Blazer
1st- change your pcv valve, more than likely that will solve your problem. but if it continues- check all the vacuum lines.