Southern_tree

So this is my first post here so hopefully I am in the right place.


I own a 87 f150 5.0 4-speed. Every morning when I start her up it will go to about 1800 rpm for about 30 seconds and then drop down to 800 rpm. I'm pretty sure this is normal but the problem is after it is all warmed up I will drive somewhere and then start it again it will do it all over again. It does it no matter how cold or hot it is. Seems like it's choking it self and there is nothing to tell it "hey, I'm warmed up no need for high rpm". I'm very puzzled. Also, after I get down the road for about 2 miles it will do a little "jerk" and it will drive and run so much better. Mind you that before it does the little jerk I will shift into 3rd and hear pinging noise or knocking but after the jerk I will shift into 3rd and it will haul a**. I'm very confused. These are the new parts I have on it.

TPS
EGR and sensor(took back sensor because there was no difference )
O2 sensor
Map sensor
Brake booster
Radiator
Iac
Cleaned the throttle body very well
Air filter

I ran the codes and I got 33 but I replaced the egr and there was no difference at all.

Someone please help before I go crazy please.