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yep, GM TBI.Where are you located?I still don't think the shift position has anything to do with the rpm....unless there is a wire crossed or you have a broken motor mount.Connect pin A and B of the aldl connector and turn the key on.Then listen to the IAC. It should be humming( it doesn't know the words)Disconnect IAC and turn off the key.Then remove jumper.Start motor and repeat your revving test.Stick a finger over the hole above the IAC and make sure no vacuum is present.If it fails to rev up in drive then reconnect IAC and start motor back up and try it again.Here's a pick of the connector.And this MAP sensor is mounted wrong.It should be above the vacuum port and the nipple pointed down.
yep, GM TBI.
Where are you located?
I still don't think the shift position has anything to do with the rpm....unless there is a wire crossed or you have a broken motor mount.
Connect pin A and B of the aldl connector and turn the key on.
Then listen to the IAC. It should be humming( it doesn't know the words)
Disconnect IAC and turn off the key.
Then remove jumper.
Start motor and repeat your revving test.
Stick a finger over the hole above the IAC and make sure no vacuum is present.
If it fails to rev up in drive then reconnect IAC and start motor back up and try it again.
Here's a pick of the connector.
And this MAP sensor is mounted wrong.
It should be above the vacuum port and the nipple pointed down.
