A couple of little problems [Idle, reverse]
Hi! I just bought a 96 Thunderbird LX a month or so ago and It's had some strange problems I just can't figure out.
Car on, in park, it's fine,
Car on, brake down, in drive and not moving it vibrates very noticably.
Car on, brake down, in reverse it does the same thing and sometimes the revs jump up and down.
Now recently reversing has become almost impossible, because it stalls out. I have to restart the engine twice sometimes to get out of a parking spot.
At speed and driving it's perfectly fine though. And right after I bought it I did a tuneup, replaced oil and filter, coolent flush, new spark plugs, transmission oil and filter, seafoam [Tank, oil, and intake], and replaced the airfilter with a Spectre one and deleted the silencer. Also replaced some dried up vacuum hoses.
It idles about at 600-650 RPM, which to me is way too low. When you first shift from park to reverse or drive it dips under 500 too. I've checked for vacuum leaks and found none. I was also wondering if there is a typical spot that leaks like to find. [Taurus love to eat up PVC elbows]
I'm also wondering if it's the IAC but I have not checked.
Thanks for anyhelp with this problem!