Well, water pump's are wear items, so IMO it's always good to replace it. I should change mine out, actually...

Swollen hoses also interfere with the cooling system purge, as it expands and contracts with pressure/vacuum.

Let us know what happens with the new parts

I am experiencing the exact same problem with the 86.5 7mge I just purchased. If you fix the problem please let me know what you did. I am going to start by replacing some vacuum lines.

Good luck to you too, and if you figure it out before I do let me know as well...thanx

Right as it sttarts to hesitate I start to smell a strong odor of gasoline I just recently started running 91 grade was running 89 grade or mid grade. I'm starting to think it may be the timing or bad injectors...maybe even both.

eh? upgrading the fuel could cause problems? I thought it was if you downgraded the fuel, you were more susceptible to problems?

No, I still have the stock fuel system set up for the N/A. I want to upgrade my system eventually when I get to that stage. But, I was saying that since my injectors are so old they are probably wearing or worn out already thus causing hesitation at times. Or my timing could be off and causing the problem too I have to look into that after fixing my current problems.

Bhg?
 

Check your plugs - if they look like coolant or have deposits its a BHG - Start with NO 6 as that is the most common - All plugs should be dry and light tan. Mine ran rough after sitting overnight and was burning coolant same on acceleration

I just got done with that same issue on my 87, I replaced the head gasket had all new hoses installed, put a new water pump on and fan clutch. All to find out my radiator wasn't cooling to specification so when the car stopped the pressure was still in the system as the coolant was too hot. I HIGHLY recommend taking out the radiator, take it to a radiator shop and have them flow test it. The average cost is around $15.00. It may save you hundreds in the long run and either way you know for certain if it is or isn't good enough at cooling. As the radiator heats up the fins are supposed to disperse the heat although a Toyota that is older sometimes has their radiators deteriorate. the money you spend on getting it tested will easily pay for your time and frustration in the long run.

Thanks for the input I'll look into that, I was wanting to get an aluminum radiator any ways now I might have a reason to get it earlier than anticipated :D

Alright, so I finally changed out my water pump and two more short hoses that had a crack in them and were swollen. I noticed that there is some pitting or scraping inside the chamber where the water pump sat, hopefully it's nothing to be concerned about. The water pump didn't didn't look too bad, but I changed it out anyways to keep from doing it later on down the road. In the process of it all I ended up with a broken temp fuel control sensor I think that's what it's called and now have to wait until Thursday or Friday for the part to come in from Toyota. So, now I won't be able to test out my work until then. But on the positive side it forces me to wait to make sure I have a good seal formed before I put antifreeze in and start putting pressure back on the system, should be good since I used high temp RTV in place of the gasket cause the gasket it came with was destroyed to begin with.