If I have a 1099 in my tax return this year with my W2 will that stall my stimulus?

[MinhT1]

The 1099  together with your W-2 will not in itself stall your stimulus.

Your eligibility for the third stimulus is based on your Adjusted Gross Income. As a single filer, if your AGI is less than $75,000, you are eligible for the full stimulus of $1,400. Between $75,000 and $80,000, you'll have a reduced amount. And above $80,000, you are not eligible.

[SweetieJean]

Not necessarily.   Your tax return could require a manual review if, for example, you claimed a large amount of self-employment expenses relative to that 1099 income.