My 1990 chevy truck 4.3 tbi wont stay running cant even leave my driveway. i changed fuel pump fuel filter map sensor the lil module under the distributar cap the coolant sensor. when i crank it up somes time it cranks right up it will idle ok i hit the gas it dies i let go of gas it start to sputter really bad and then dies. i watched the injectors go from a slow drizzle during idle to a fan and then to a fat type jet when all the way open but this will do this as its dying so i dont think its tps seems like pressure is good in the gas just wont idle right bog down if i keep hitting throttle as its dying in idle it catch for a sec then goto die again so if i pulse the throttle it will stay running but sputters really bad any i also changed spark plugs and distrib cap like 2 months ago nothing seems to be working and im at my last end with this truck please someone help i dont have a voltmeter nor a pressure guage the check engine light is on i did the thing to get the lights to flash but i dont know if im reading it right 121212343435 is what the lights flashed please someone help me out
Code 12 means you are in test mode, code 34 is a problem with the map sensor, and code 35 is a problem with the idle control valve.
But those two codes could show up if you disconnect those sensors or if the engine is having other problems.
In situations where the engine stalls, it is very easy to overlook something or assume a component is working.
Treat it like a no start. Pull a plug wire and watch the spark as the engine dies. Use carb cleaner or starting fluid to boost fuel supply.
You'll have to figure out if it is loosing spark or fuel to proceed.
Things like the coil, the stator in the bottom of the dist, or a relay can be the cause. Even low fuel pressure.
SOURCE: 1987 Chevrolet S-10 Pickup1987 chevy s10 2.5l tbi
Check the trottle body postioning sensor...
SOURCE: 1987 chevy S10 engine idle problem
relace the throtle air idle valve.The temp switch will allso cause this problem.
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