'89 350 tbi 5 speed stalling and surging idle

[bowtie5]

Hello everyone and thanks in advance for your help.

I have been experiencing a surging idle with stalling at stops or as I slow down. I have a 5 speed so I dump the clutch and the idle drops very low and rough.

Had this problem when I bought the truck. I did plugs, wires, cap and rotor. Had bad fuel pump and I replaced filter with it. Took it to a shop to diagnose the idle and it had a map sensor code. Shop replaced map sensor and egr, as well as a new water temp sensor and 205 degree thermostat. Didn't stall for quite a while, but the idle was still a little low at stops.

There are currently no engine codes showing. Fuel consumption seems to be quite terrible lately too.

Hope I have given enough info. Thanks again.