TRUCK RUNS LIKE CRAP WHEN WARMED UP?

MY 91 CHEV 1500 RUNS LIKE CRAP WHEN IT REACHES OPERATING TEMP. I HAVE REPLACED MY PLUGS,WIRES ,CAP, ROTOR, IGNITION P/U, IGNITION MODULE
AND THE DISTRIBUTOR SHAFT , IVE SET MY TIMING TO 0 DEG LIKE THE STICKER SAYS UNDER THE HOOD. ONCE IT WARMS UP I HAVE NO POWER AND CANNOT REACH
100KMH ON THE HIWAY EVEN AND MY FUEL MILAGE SUCKS. WHAT ELESE CAN I DO?

have you checked the o2 sensor??

You didn't say if you've had a check engine light or anything, but it does sound like a sensor problem, either O2 or temperature. Autozone (if you have one nearby) will read the codes for you for free and that might point you in the right direction. You could have a code stored even if you haven't gotten the check engine light. I had similar problem on an old Caddy once and it turned out the pick up coil was turned very slightly out of position. Let us know what you find.

SERVICE ENGINE LIGHT COMES ON PERIODICALY USUALLY WHEN WARMED UP

WILLI --- Define "runs like crap". Does it miss? or bog? Or does it run basicly smooth, but just does'nt have any power? If the later is the case you might have a clogged cat.

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ORIGINAL: WILLI

SERVICE ENGINE LIGHT COMES ON PERIODICALY USUALLY WHEN WARMED UP

Definitely you need to get the codes read. That should point you in the right direction.

did u disconnect the wire from under the dash (passenger side) before u set the timing? this will cause your timing to b retarded if u didn't (loss of power).

i disconnected the wire under the hood not under the dash, but if i leave the wire disconected it runs alought better even get better fuel milage

u said:

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i disconnected the wire under the hood not under the dash

????????? what wire under the hood?????????