1993 Chevy Blazer Not enough power

No the check engine light is not on. And I'm not sure when it had a tune up, just got it about 6 months ago.

Hey there, I know its been while but I finally just got done doing the tune up on the Blazer. I am still havign the same problems as in my previous post. I have now replaced fuel pump, filter, sending unit, strainer, air filter, spark plugs, distributor cap and plugs, and the MAP sensor. Have checked the timing and it is fine. Out of ideas. Please help

No the check engine light has never come on. I checked the code reading and all I got was a 33 which is why I replaced the MAP and it does seem to run a little better, however once the engine warms up it idles real rough and stalls out. If you can get it to drive it surges. It will go then all of a sudden it will get like a big burst of gas and spin out the tires, then lose power again. It just keeps repeating this. As long as its cold it runs great though. I brought it to one place already and was told they couldnt read it cuz it was to old for anything to show up. And they still charged me $50 bucks. Some one told me that it might be the TPS or the Idle air control valve. What do you think. Tired of spending money on parts if I dont need to. Thanks for you help