High Idle in park

[bigsyke]

So on my 1987 pathfinder Vg30i, ive tried adjusting all the idle controls, and to prevent misfiring/backfiring (seems like it hits a rev limiter per say), I have to keep the Parked Idle under 1k-rpms. When I put it in Drive, the RPM's drop to 400 or so. It seems all the configurations (aside from having the Park idle @ 1500), I can not get the Drive idle at 700-800 rpms.

 

I have cleaned the TBI, and Maf. Im wondering if the TPS is incorrectly adjusted possibly? Another thing is when Decellerating, the engine seems to jerk and the idle tends to drop "about 300rpms" - once I hit around 1200rpms durring decelleration.

 

Has anyone else experienced this issue? High idle in park, low idle in drive?