I have an 88 s10 blazer that is surging like the fuel injectors are being cut on and off.It is drivin me krazy ,I have changed fuel pump ,all fuel filters,injectors,rebuilt tbi unit ,throttle position sensor,iacv,all vacuum lines,coil,temp sending unit, O2 sensor,fuel pump relay,ECM,map sensor. Runnin out of money and need my truck for work ,can anyone please help? Oh the trouble code that showed up was map sensor.

 

Fixed it,and no one would have ever guessed it. The motor mounts were shot and messing with the knock sensor. Two new mounts and she runnin better than ever!

 

Thanks for posting what your issue was. I am having similar trouble and I will have to check and see if my mounts are ok.