Hello first time on I have a 99 k1500 suburban with 80,000 miles 2nd engine I replace the lower intake on it about 4 months ago and it started to give me a high idle around 1000 rpms so I left it alone for 4 months now I’m back at it I’ve had the engine smoked for leaks seams to be sealed I’ve sprayed it with carb cleaner numerous times I’ve checked vacuum lines changed tps/idle control sensors pulled distributor several times now having a 1345 code will this code cause a high idle

 

Might be off a tooth on distributor I'd get rid of your cap and rotor too unless they are new. Check your cam sensor too.

 

Have also seen numerous stories of the fuel injection spiders causing problems.

Code P1345:

Common Symptoms

Regardless of the make and model of the vehicle, the common symptoms of this code are usually the same, such as:

• Stalling
• Rough idle
• Difficulty starting
• Engine misfire above 1500 RPM

For GM vehicles (Chevrolet, GMC, etc.) this could be caused by a lot of factors, such as slipped or improperly installed valve timing chain. Loose or defective CKS or CMS, or the ignition timing and correlation has exceeded more than 2˚ separation between the CKS and CMS signal. The mechanical valve timing may be off.Usual diagnosis, however, requires checking for:

• Loose or missing distributor hold down bolt
• Loose CMP sensor causing variance in the sensor signal
• Loose distributor rotor on the distributor shaft
• Wrongly installed distributor-1 tooth OFF in either advanced or retard positions
• Excessive free play in the timing chain and gear assembly

For intermittent conditions, the problem may be caused by:

• Rubbed through or scuffed through wire insulation
• Poor connection
• Broken wire inside its insulation

How to Fix

As said earlier, diagnosis differs from one make and model, so does its repair. The common repairs, however, can be:

• Replacement of the crankshaft position sensor
• Check for proper installation of the distributor, repair as necessary

In many cases, this code is usually caused by simple electrical connection failure or a failed camshaft sensor. Loose CKS and CMS are also possible, but highly unlikely.

Also, it’s rare for the timing chain to jump a tooth unless the vehicle has extremely high mileage. The chain tensioner can also wear out, making a big deal of slack in the chain.