Idles rough and stalls code p1251. cleared codes and reset throttle linkage. Now eng light comes on when 100% throttle but does not stall. ????

Throttle actuator system stuck closed. Throttle body valve stuck/tight

You need to put a scanner on the truck and see if any codes are set and if so of course repair them and then clear the codes in the computer with the scanner. I would check the idle air control and the throttle position sensor. I would also check the alternator by starting the truck and then taking off the positive battery cable and the truck should continue to run. If not the alternator that was put on is bad.

on dodge motors
fitted a lot of parts and still no better

the fault code clears and comes back as a intermittent problem

could be electrical voltage drop off or heat related failure

i wonder if your 02 sensor ,the catalytic converter
or other related sensors
are causing the fault to come back
if needed .....fit a new air filter...

how the test is determined

P1294-TARGET IDLE NOT REACHED 3.3L/3.8L
When Monitored and Set Condition:
P1294-TARGET IDLE NOT REACHED 3.3L/3.8L
When Monitored: With the engine idling and the transmission in drive, if automatic.
There must not be a MAP sensor trouble code or a Throttle Position Sensor trouble code.
Set Condition: The engine idle is not within 200 rpm above or 100 rpm below the target
idle for 40 seconds. One trip fault.

POSSIBLE CAUSES
INTERMITTENT CONDITION
IAC MOTOR PASSAGES
VACUUM LEAKS
AIR INDUCTION SYSTEM
THROTTLE BODY AND THROTTLE LINKAGE
TEST ACTION APPLICABILITY

When the check engine light is turned on by the powertrain control module (computer) a fault code is stored to record what it is that caused the fault, in order to begin the process of diagnosis of this problem you have you must have the control module scanned for the stored codes.

if the check eng light is on have it scaned . check the fuel psi,check for spark to all plugs.

try replacing the throttle position sensor

Is the check engine light on? If so, have the fault codes read with a scan tool. Most autoparts stores provide this service at no charge. It sounds to me like a faulty throttle position sensor, but it could be something else. The codes will tell you more surely where to begin looking. Hope this helped.

maybee its the batery starting to fail.or maybee it could be ht leads

I had the same exact problem on my 2004 Colorado (3.5L). Cleaned the MAF sensor (with MAF sensor cleaner) and throttle body/plate - cleared it right up.

The plug is located at the bottom of the steering column.The fault seems to be the mass air meter though.