1FZ stutters with press of throttle and shifting into R or D (1 Viewer)

[Cain360]

I’m having issues with my newly rebuilt motor. Did a head gasket replacement and now can’t seem to get it to run correctly. Pressing the throttle it stutters and drops rpm and sometimes will stall. Also sometimes shifting into R or D it will stall as well.
I’ve set the timing
Check the mass aiflow sensor
Checked for any vacuum leaks

Any other recommendations to try?

 

[jfz80]

Did you inspect the accordion section of air intake tube? Perhaps cracked during RnR operations?

 

[FJW8ing]

The shop manual has a helpful troubleshooting table at the front of the engine section - take a look at that. I would put a screen shot here but I have the 93/94 manual. Have you done a post head gasket compression or leak down test?

Possible vacuum leaks are a good suggestion.

Since MAF is good I would check next:
Idle air control valve
Fuel pressure

 

[ajax1]

Is this first starts? Computer will need to relearn, sounds like you got low idle?

 

[Cain360]

Did you inspect the accordion section of air intake tube? Perhaps cracked during RnR operations?

Yes I did l! Checked for cracks!

 

[Cain360]

The shop manual has a helpful troubleshooting table at the front of the engine section - take a look at that. I would put a screen shot here but I have the 93/94 manual. Have you done a post head gasket compression or leak down test?

Possible vacuum leaks are a good suggestion.

Since MAF is good I would check next:
Idle air control valve
Fuel pressure

Have not done a compression or leak down test. I’ll give the manual a look and see. Along with checking iac and fuel pressure

 

[Cain360]

Is this first starts? Computer will need to relearn, sounds like you got low idle?

First starts yes. Sorry didn’t say earlier but it idles great!