codes 32 and 43 , 89' 350 need help

[Soopa Villain17]

today i my truck threw 2 codes. 43; esc failure or knock sensor failure , and 32; egr failure. ive pretty much lost have of the power the truck use to have , im pretty sure this is caused by these 2 codes. what can i do to fix them , what can i check , what can i do ? just replace it all , how much is a esc or knock sensor. how can i figure out wich part of my egr system is failing ? maybe its a vaccum leak ? also when the truck idles for about 2 or 3 minutes the idle starts to flucuate. now my oil pressure gauge doesnt work , it goes all the way to 60 or whatever the guage's highest reading is , but when the idle starts to flucuate the oil pressure gauge moves ? i finaly got the water pump thing straightend out now id like to get it running better. i really need you guy's help. thanks

chris aka fattie

[355smallblock]

The Esc Stands For Electronic Spark Control Its Incoporated Into The Ignition Module In The Distributor And The Ecm.when The Engine Starts The Module Controls Spark Timing For A Predetermined Amount Of Time Then The Computer Sends A Bypass Signal To The Module To Allow The Computer To Take Over.you Need To Check For The Signal If You Have It It's A Bad Module If Not It A Bad Ecm