need help not shifting into 3rd or fourth

[firstZ71yukon]

I have a 95 Yukon and my problem is I just put a new 350 in it 30 it over with a cam and now it does not want to shift gears barely it will go into second but it gets stuck and did not want to come out a second or doesnt go to the 3rd or 4th gear not too sure what's going on and if it does shift it does not shift until redline

 

[SunlitComet]

under automatic control only or manual control as well?

 

[firstZ71yukon]

I just replaced the tps n now its shifting up but won't come back down unless I manually shift it down

 

[SunlitComet]

doe your speedo work correctly?

 

[firstZ71yukon]

Yea both speedo and tach work

---------- Post added at 01:55 PM ---------- Previous post was at 12:43 PM ----------

My number is 6016638110 if anyone doesn't mind helping me out

 

[SunlitComet]

do you have any active or stored trouble codes?

 

[retorq]

Who did the chip tune??

 

[firstZ71yukon]

I don't have a tune. I was hoping I wasn't needing one...n I just replaced the IAC sensor cause The other one looked kinda burnt....but now it won't stay running its like its choking out or no fuel

 

[SunlitComet]

Don't know much about your setup but maybe it was a bit to much without new programming.

 

[firstZ71yukon]

Its a 350 .30 over .10 on rods .20 on mains. With a melling 468/480 lift with a duration of 214/ 223

 

[SunlitComet]

can you tap into the evap canister purge line on the throttle body and see what kind of vacuum reading you can get? Any chance you damaged a wire mounting everything back in?

---------- Post added at 07:08 AM ---------- Previous post was at 07:02 AM ----------

Can you also test your MAP? if you need info on this let me Know. Hate to see you just throw money on part when you think it might be it. Mind you the IAC replacement sounded justified.

 

[firstZ71yukon]

How would I to about testing the map and evap purge line....n everything is back in the way it came out just with a few new sensors..

---------- Post added at 06:40 PM ---------- Previous post was at 05:44 PM ----------

I also just checked my codes n it keeps only giving 12 which is normal system

 

[SunlitComet]

you can use the evap connection to measure the engine vacuum with a vacuum gauge.
And actually for the map you can try to back probe the sensor while using a hand vacuum pump or get a obd1 scan tool that can read the data form your ecm. Tho I would think that unless you get debris in the sensor port or its seal got damaged really bad from removal that sensor should not be a problem.

 

[firstZ71yukon]

I believe its my first gear Spragg thats messed up and I believe that my spark plugs are followed therefore not giving enough start to start the engine

 

[SunlitComet]

pics of the plugs?