test drove a 2001 2500 iwas almost ready to buy, was running it hard! all was fine for the first 15 minutes the it started to buck -miss when shifting into 3rd i should have drove it back but i didnt they just replaced the lift pump last week , i ran it hard tru the gears with the same bucking situation then it just quit. the codes flashing were p1693 p0230 p1689 i hope its the ip- if they replace i,ll consider buying. what codes are these and should i run from this truck or buy it it has 122000 on it thankx for any advice

 

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Injection Pump is most likely TOAST.
If that was the only problem, and they replace the pump, depending on the negotiated price, it sounds like a decent buy.