This could be due to wear on the timing gears and chain or the cam. Given the calendar age of the vehicle since you did not post the mileage, you may want to have the whole engine checked for wear.
SOURCE: HAVE CODE P1345 IN 98 CHEVY 1500 CAMSHAFT TO
I have the same year truck as you do. Replaced engine last year and now this same exact thing is going on. I've talked to several people with the same problem. They have said to check the distributor and see if the bushing is worn out. This will cause the reluctor wheel to hit or miss the CAM sensor. Causing the sensor not to get the correct reading. So I took my truck to a very reputable garage, sure enough 12% difference between the CAM and CRANK sensors. Now if the distributor needs a new bushing or replaced a Automotive shop has to "relearn" the the system. After you replace either one. So that they are working together.
SOURCE: Camshaft To Crankshaft Position Correlation
Either one of the sensors is at fault or the timing chain has jumped a cog tooth. I would check out the former option thoroughly as a) it is more likely and b) much easier and cheaper to sort. You need to locate both the crank (CKP) shaft position and cam (CMP) shaft position sensors:
How to check? If a sensor has died completely there will be very high resistance
between the device's electrical connections associated with the open
circuit. First check that the electrical connection is clean
and secure; dirt or corrosion can impair an otherwise healthy sensor signal from
getting through. If the sensor suffers from
a drop in voltage associated with heat increase this can only be detectable
with a voltmeter or oscilloscope with a graphical display; an analogue display
voltmeter might just be able to show needle fluctuations due to voltage
variation output.
There are two types of sensor used: 2 pin socket (magnetic - sine wave
output). One pin is 'ground' the other
is 'signal'. A voltmeter set to 2 volts
AC should measure a signal in the 0.2 to 2 volts range on the 'signal' pin. 3
pin socket (Hall effect, magneto - square wave form output). One pin is 'reference' (5volts), one pin is
'ground' and the third pin is 'signal'.
A DC voltage should be detectable in the 0.5 to 1.5 volt range from the
'signal' pin. It is important that the voltage
measurement take place at start up when the engine is cold and again, 20
minutes later, when the engine has fully warmed up to operating temperature.
Often the voltage output from faulty sensors declines with temperature rise. How to fix? Check the wiring for continuity and
that the electrical connection is clean and secure. Remove the CKP and clean off any dirt build up
on the tip. If you strongly
suspect the sensor as being at fault it is a relatively inexpensive device
to replace.
was the distributor move, sometimes the rotor in the distributor will move just a hair. turn the motor by hand to tdc and see where the rotor is pointing
Testimonial: "Well we did the whole timing kit and it was trying to hit on the exaust and so i fixed the timing and EVERYTHING is lined up and now its hitting on the intake but its misfireing like crazy and throwing the above codes... "
SOURCE: camshaft position sensor correlation bank 1 code
timing belt is off by a tooth or two. you probably didn\'t have to replace the coolant sensor; that code sets whenever the sensor is disconnected and the ignition is turned on; and it needs to be reset by disconnecting the battery or with a code reader. anyway, the crank/ cam sensors are out of sync. if you\'ve got the twin cam engine, they are a royal pain to get the belt to lay properly on the two cams.
Testimonial: "got it in time but it is giving a p0016 code, and at around 30 mph the rev limiter is coming on"
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